/**
 * @file
 * Management Information Base II (RFC1213) objects and functions.
 *
 * @note the object identifiers for this MIB-2 and private MIB tree
 * must be kept in sorted ascending order. This to ensure correct getnext operation.
 */

/*
 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * Author: Christiaan Simons <christiaan.simons@axon.tv>
 */

#include "lwip/opt.h"

#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */

#include "lwip/snmp.h"
#include "lwip/netif.h"
#include "lwip/ip.h"
#include "lwip/ip_frag.h"
#include "lwip/mem.h"
#include "lwip/tcp_impl.h"
#include "lwip/udp.h"
#include "lwip/snmp_asn1.h"
#include "lwip/snmp_structs.h"
#include "lwip/sys.h"
#include "netif/etharp.h"

/**
 * IANA assigned enterprise ID for lwIP is 26381
 * @see http://www.iana.org/assignments/enterprise-numbers
 *
 * @note this enterprise ID is assigned to the lwIP project,
 * all object identifiers living under this ID are assigned
 * by the lwIP maintainers (contact Christiaan Simons)!
 * @note don't change this define, use snmp_set_sysobjid()
 *
 * If you need to create your own private MIB you'll need
 * to apply for your own enterprise ID with IANA:
 * http://www.iana.org/numbers.html
 */
#define SNMP_ENTERPRISE_ID 26381
#define SNMP_SYSOBJID_LEN 7
#define SNMP_SYSOBJID {1, 3, 6, 1, 4, 1, SNMP_ENTERPRISE_ID}

#ifndef SNMP_SYSSERVICES
	#define SNMP_SYSSERVICES ((1 << 6) | (1 << 3) | ((IP_FORWARD) << 2))
#endif

#ifndef SNMP_GET_SYSUPTIME
	#define SNMP_GET_SYSUPTIME(sysuptime)  (sysuptime = (sys_now() / 10))
#endif

static void system_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
static void system_get_value(struct obj_def* od, u16_t len, void* value);
static u8_t system_set_test(struct obj_def* od, u16_t len, void* value);
static void system_set_value(struct obj_def* od, u16_t len, void* value);
static void interfaces_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
static void interfaces_get_value(struct obj_def* od, u16_t len, void* value);
static void ifentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
static void ifentry_get_value(struct obj_def* od, u16_t len, void* value);
#if !SNMP_SAFE_REQUESTS
	static u8_t ifentry_set_test(struct obj_def* od, u16_t len, void* value);
	static void ifentry_set_value(struct obj_def* od, u16_t len, void* value);
#endif /* SNMP_SAFE_REQUESTS */
static void atentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
static void atentry_get_value(struct obj_def* od, u16_t len, void* value);
static void ip_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
static void ip_get_value(struct obj_def* od, u16_t len, void* value);
static u8_t ip_set_test(struct obj_def* od, u16_t len, void* value);
static void ip_addrentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
static void ip_addrentry_get_value(struct obj_def* od, u16_t len, void* value);
static void ip_rteentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
static void ip_rteentry_get_value(struct obj_def* od, u16_t len, void* value);
static void ip_ntomentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
static void ip_ntomentry_get_value(struct obj_def* od, u16_t len, void* value);
static void icmp_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
static void icmp_get_value(struct obj_def* od, u16_t len, void* value);
#if LWIP_TCP
	static void tcp_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
	static void tcp_get_value(struct obj_def* od, u16_t len, void* value);
	#ifdef THIS_SEEMS_UNUSED
		static void tcpconnentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
		static void tcpconnentry_get_value(struct obj_def* od, u16_t len, void* value);
	#endif
#endif
static void udp_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
static void udp_get_value(struct obj_def* od, u16_t len, void* value);
static void udpentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
static void udpentry_get_value(struct obj_def* od, u16_t len, void* value);
static void snmp_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od);
static void snmp_get_value(struct obj_def* od, u16_t len, void* value);
static u8_t snmp_set_test(struct obj_def* od, u16_t len, void* value);
static void snmp_set_value(struct obj_def* od, u16_t len, void* value);


/* snmp .1.3.6.1.2.1.11 */
const mib_scalar_node snmp_scalar = {
	&snmp_get_object_def,
	&snmp_get_value,
	&snmp_set_test,
	&snmp_set_value,
	MIB_NODE_SC,
	0
};
const s32_t snmp_ids[28] = {
	1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16,
	17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30
};
struct mib_node* const snmp_nodes[28] = {
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar,
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar,
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar,
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar,
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar,
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar,
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar,
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar,
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar,
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar,
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar,
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar,
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar,
	(struct mib_node*)& snmp_scalar, (struct mib_node*)& snmp_scalar
};
const struct mib_array_node snmp = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	28,
	snmp_ids,
	snmp_nodes
};

/* dot3 and EtherLike MIB not planned. (transmission .1.3.6.1.2.1.10) */
/* historical (some say hysterical). (cmot .1.3.6.1.2.1.9) */
/* lwIP has no EGP, thus may not implement it. (egp .1.3.6.1.2.1.8) */

/* udp .1.3.6.1.2.1.7 */
/** index root node for udpTable */
struct mib_list_rootnode udp_root = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_LR,
	0,
	NULL,
	NULL,
	0
};
const s32_t udpentry_ids[2] = { 1, 2 };
struct mib_node* const udpentry_nodes[2] = {
	(struct mib_node*)& udp_root, (struct mib_node*)& udp_root,
};
const struct mib_array_node udpentry = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	2,
	udpentry_ids,
	udpentry_nodes
};

s32_t udptable_id = 1;
struct mib_node* udptable_node = (struct mib_node*)& udpentry;
struct mib_ram_array_node udptable = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_RA,
	0,
	&udptable_id,
	&udptable_node
};

const mib_scalar_node udp_scalar = {
	&udp_get_object_def,
	&udp_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_SC,
	0
};
const s32_t udp_ids[5] = { 1, 2, 3, 4, 5 };
struct mib_node* const udp_nodes[5] = {
	(struct mib_node*)& udp_scalar, (struct mib_node*)& udp_scalar,
	(struct mib_node*)& udp_scalar, (struct mib_node*)& udp_scalar,
	(struct mib_node*)& udptable
};
const struct mib_array_node udp = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	5,
	udp_ids,
	udp_nodes
};

/* tcp .1.3.6.1.2.1.6 */
#if LWIP_TCP
/* only if the TCP protocol is available may implement this group */
/** index root node for tcpConnTable */
struct mib_list_rootnode tcpconntree_root = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_LR,
	0,
	NULL,
	NULL,
	0
};
const s32_t tcpconnentry_ids[5] = { 1, 2, 3, 4, 5 };
struct mib_node* const tcpconnentry_nodes[5] = {
	(struct mib_node*)& tcpconntree_root, (struct mib_node*)& tcpconntree_root,
	(struct mib_node*)& tcpconntree_root, (struct mib_node*)& tcpconntree_root,
	(struct mib_node*)& tcpconntree_root
};
const struct mib_array_node tcpconnentry = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	5,
	tcpconnentry_ids,
	tcpconnentry_nodes
};

s32_t tcpconntable_id = 1;
struct mib_node* tcpconntable_node = (struct mib_node*)& tcpconnentry;
struct mib_ram_array_node tcpconntable = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_RA,
	/** @todo update maxlength when inserting / deleting from table
	   0 when table is empty, 1 when more than one entry */
	0,
	&tcpconntable_id,
	&tcpconntable_node
};

const mib_scalar_node tcp_scalar = {
	&tcp_get_object_def,
	&tcp_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_SC,
	0
};
const s32_t tcp_ids[15] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
struct mib_node* const tcp_nodes[15] = {
	(struct mib_node*)& tcp_scalar, (struct mib_node*)& tcp_scalar,
	(struct mib_node*)& tcp_scalar, (struct mib_node*)& tcp_scalar,
	(struct mib_node*)& tcp_scalar, (struct mib_node*)& tcp_scalar,
	(struct mib_node*)& tcp_scalar, (struct mib_node*)& tcp_scalar,
	(struct mib_node*)& tcp_scalar, (struct mib_node*)& tcp_scalar,
	(struct mib_node*)& tcp_scalar, (struct mib_node*)& tcp_scalar,
	(struct mib_node*)& tcpconntable, (struct mib_node*)& tcp_scalar,
	(struct mib_node*)& tcp_scalar
};
const struct mib_array_node tcp = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	15,
	tcp_ids,
	tcp_nodes
};
#endif

/* icmp .1.3.6.1.2.1.5 */
const mib_scalar_node icmp_scalar = {
	&icmp_get_object_def,
	&icmp_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_SC,
	0
};
const s32_t icmp_ids[26] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 };
struct mib_node* const icmp_nodes[26] = {
	(struct mib_node*)& icmp_scalar, (struct mib_node*)& icmp_scalar,
	(struct mib_node*)& icmp_scalar, (struct mib_node*)& icmp_scalar,
	(struct mib_node*)& icmp_scalar, (struct mib_node*)& icmp_scalar,
	(struct mib_node*)& icmp_scalar, (struct mib_node*)& icmp_scalar,
	(struct mib_node*)& icmp_scalar, (struct mib_node*)& icmp_scalar,
	(struct mib_node*)& icmp_scalar, (struct mib_node*)& icmp_scalar,
	(struct mib_node*)& icmp_scalar, (struct mib_node*)& icmp_scalar,
	(struct mib_node*)& icmp_scalar, (struct mib_node*)& icmp_scalar,
	(struct mib_node*)& icmp_scalar, (struct mib_node*)& icmp_scalar,
	(struct mib_node*)& icmp_scalar, (struct mib_node*)& icmp_scalar,
	(struct mib_node*)& icmp_scalar, (struct mib_node*)& icmp_scalar,
	(struct mib_node*)& icmp_scalar, (struct mib_node*)& icmp_scalar,
	(struct mib_node*)& icmp_scalar, (struct mib_node*)& icmp_scalar
};
const struct mib_array_node icmp = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	26,
	icmp_ids,
	icmp_nodes
};

/** index root node for ipNetToMediaTable */
struct mib_list_rootnode ipntomtree_root = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_LR,
	0,
	NULL,
	NULL,
	0
};
const s32_t ipntomentry_ids[4] = { 1, 2, 3, 4 };
struct mib_node* const ipntomentry_nodes[4] = {
	(struct mib_node*)& ipntomtree_root, (struct mib_node*)& ipntomtree_root,
	(struct mib_node*)& ipntomtree_root, (struct mib_node*)& ipntomtree_root
};
const struct mib_array_node ipntomentry = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	4,
	ipntomentry_ids,
	ipntomentry_nodes
};

s32_t ipntomtable_id = 1;
struct mib_node* ipntomtable_node = (struct mib_node*)& ipntomentry;
struct mib_ram_array_node ipntomtable = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_RA,
	0,
	&ipntomtable_id,
	&ipntomtable_node
};

/** index root node for ipRouteTable */
struct mib_list_rootnode iprtetree_root = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_LR,
	0,
	NULL,
	NULL,
	0
};
const s32_t iprteentry_ids[13] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 };
struct mib_node* const iprteentry_nodes[13] = {
	(struct mib_node*)& iprtetree_root, (struct mib_node*)& iprtetree_root,
	(struct mib_node*)& iprtetree_root, (struct mib_node*)& iprtetree_root,
	(struct mib_node*)& iprtetree_root, (struct mib_node*)& iprtetree_root,
	(struct mib_node*)& iprtetree_root, (struct mib_node*)& iprtetree_root,
	(struct mib_node*)& iprtetree_root, (struct mib_node*)& iprtetree_root,
	(struct mib_node*)& iprtetree_root, (struct mib_node*)& iprtetree_root,
	(struct mib_node*)& iprtetree_root
};
const struct mib_array_node iprteentry = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	13,
	iprteentry_ids,
	iprteentry_nodes
};

s32_t iprtetable_id = 1;
struct mib_node* iprtetable_node = (struct mib_node*)& iprteentry;
struct mib_ram_array_node iprtetable = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_RA,
	0,
	&iprtetable_id,
	&iprtetable_node
};

/** index root node for ipAddrTable */
struct mib_list_rootnode ipaddrtree_root = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_LR,
	0,
	NULL,
	NULL,
	0
};
const s32_t ipaddrentry_ids[5] = { 1, 2, 3, 4, 5 };
struct mib_node* const ipaddrentry_nodes[5] = {
	(struct mib_node*)& ipaddrtree_root,
	(struct mib_node*)& ipaddrtree_root,
	(struct mib_node*)& ipaddrtree_root,
	(struct mib_node*)& ipaddrtree_root,
	(struct mib_node*)& ipaddrtree_root
};
const struct mib_array_node ipaddrentry = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	5,
	ipaddrentry_ids,
	ipaddrentry_nodes
};

s32_t ipaddrtable_id = 1;
struct mib_node* ipaddrtable_node = (struct mib_node*)& ipaddrentry;
struct mib_ram_array_node ipaddrtable = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_RA,
	0,
	&ipaddrtable_id,
	&ipaddrtable_node
};

/* ip .1.3.6.1.2.1.4 */
const mib_scalar_node ip_scalar = {
	&ip_get_object_def,
	&ip_get_value,
	&ip_set_test,
	&noleafs_set_value,
	MIB_NODE_SC,
	0
};
const s32_t ip_ids[23] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 };
struct mib_node* const ip_nodes[23] = {
	(struct mib_node*)& ip_scalar, (struct mib_node*)& ip_scalar,
	(struct mib_node*)& ip_scalar, (struct mib_node*)& ip_scalar,
	(struct mib_node*)& ip_scalar, (struct mib_node*)& ip_scalar,
	(struct mib_node*)& ip_scalar, (struct mib_node*)& ip_scalar,
	(struct mib_node*)& ip_scalar, (struct mib_node*)& ip_scalar,
	(struct mib_node*)& ip_scalar, (struct mib_node*)& ip_scalar,
	(struct mib_node*)& ip_scalar, (struct mib_node*)& ip_scalar,
	(struct mib_node*)& ip_scalar, (struct mib_node*)& ip_scalar,
	(struct mib_node*)& ip_scalar, (struct mib_node*)& ip_scalar,
	(struct mib_node*)& ip_scalar, (struct mib_node*)& ipaddrtable,
	(struct mib_node*)& iprtetable, (struct mib_node*)& ipntomtable,
	(struct mib_node*)& ip_scalar
};
const struct mib_array_node mib2_ip = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	23,
	ip_ids,
	ip_nodes
};

/** index root node for atTable */
struct mib_list_rootnode arptree_root = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_LR,
	0,
	NULL,
	NULL,
	0
};
const s32_t atentry_ids[3] = { 1, 2, 3 };
struct mib_node* const atentry_nodes[3] = {
	(struct mib_node*)& arptree_root,
	(struct mib_node*)& arptree_root,
	(struct mib_node*)& arptree_root
};
const struct mib_array_node atentry = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	3,
	atentry_ids,
	atentry_nodes
};

const s32_t attable_id = 1;
struct mib_node* const attable_node = (struct mib_node*)& atentry;
const struct mib_array_node attable = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	1,
	&attable_id,
	&attable_node
};

/* at .1.3.6.1.2.1.3 */
s32_t at_id = 1;
struct mib_node* mib2_at_node = (struct mib_node*)& attable;
struct mib_ram_array_node at = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_RA,
	0,
	&at_id,
	&mib2_at_node
};

/** index root node for ifTable */
struct mib_list_rootnode iflist_root = {
	&ifentry_get_object_def,
	&ifentry_get_value,
#if SNMP_SAFE_REQUESTS
	& noleafs_set_test,
	&noleafs_set_value,
#else /* SNMP_SAFE_REQUESTS */
	&ifentry_set_test,
	&ifentry_set_value,
#endif /* SNMP_SAFE_REQUESTS */
	MIB_NODE_LR,
	0,
	NULL,
	NULL,
	0
};
const s32_t ifentry_ids[22] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 };
struct mib_node* const ifentry_nodes[22] = {
	(struct mib_node*)& iflist_root, (struct mib_node*)& iflist_root,
	(struct mib_node*)& iflist_root, (struct mib_node*)& iflist_root,
	(struct mib_node*)& iflist_root, (struct mib_node*)& iflist_root,
	(struct mib_node*)& iflist_root, (struct mib_node*)& iflist_root,
	(struct mib_node*)& iflist_root, (struct mib_node*)& iflist_root,
	(struct mib_node*)& iflist_root, (struct mib_node*)& iflist_root,
	(struct mib_node*)& iflist_root, (struct mib_node*)& iflist_root,
	(struct mib_node*)& iflist_root, (struct mib_node*)& iflist_root,
	(struct mib_node*)& iflist_root, (struct mib_node*)& iflist_root,
	(struct mib_node*)& iflist_root, (struct mib_node*)& iflist_root,
	(struct mib_node*)& iflist_root, (struct mib_node*)& iflist_root
};
const struct mib_array_node ifentry = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	22,
	ifentry_ids,
	ifentry_nodes
};

s32_t iftable_id = 1;
struct mib_node* iftable_node = (struct mib_node*)& ifentry;
struct mib_ram_array_node iftable = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_RA,
	0,
	&iftable_id,
	&iftable_node
};

/* interfaces .1.3.6.1.2.1.2 */
const mib_scalar_node interfaces_scalar = {
	&interfaces_get_object_def,
	&interfaces_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_SC,
	0
};
const s32_t interfaces_ids[2] = { 1, 2 };
struct mib_node* const interfaces_nodes[2] = {
	(struct mib_node*)& interfaces_scalar, (struct mib_node*)& iftable
};
const struct mib_array_node interfaces = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	2,
	interfaces_ids,
	interfaces_nodes
};


/*             0 1 2 3 4 5 6 */
/* system .1.3.6.1.2.1.1 */
const mib_scalar_node sys_tem_scalar = {
	&system_get_object_def,
	&system_get_value,
	&system_set_test,
	&system_set_value,
	MIB_NODE_SC,
	0
};
const s32_t sys_tem_ids[7] = { 1, 2, 3, 4, 5, 6, 7 };
struct mib_node* const sys_tem_nodes[7] = {
	(struct mib_node*)& sys_tem_scalar, (struct mib_node*)& sys_tem_scalar,
	(struct mib_node*)& sys_tem_scalar, (struct mib_node*)& sys_tem_scalar,
	(struct mib_node*)& sys_tem_scalar, (struct mib_node*)& sys_tem_scalar,
	(struct mib_node*)& sys_tem_scalar
};
/* work around name issue with 'sys_tem', some compiler(s?) seem to reserve 'system' */
const struct mib_array_node sys_tem = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	7,
	sys_tem_ids,
	sys_tem_nodes
};

/* mib-2 .1.3.6.1.2.1 */
#if LWIP_TCP
	#define MIB2_GROUPS 8
#else
	#define MIB2_GROUPS 7
#endif
const s32_t mib2_ids[MIB2_GROUPS] = {
	1,
	2,
	3,
	4,
	5,
#if LWIP_TCP
	6,
#endif
	7,
	11
};
struct mib_node* const mib2_nodes[MIB2_GROUPS] = {
	(struct mib_node*)& sys_tem,
	(struct mib_node*)& interfaces,
	(struct mib_node*)& at,
	(struct mib_node*)& mib2_ip,
	(struct mib_node*)& icmp,
#if LWIP_TCP
	(struct mib_node*)& tcp,
#endif
	(struct mib_node*)& udp,
	(struct mib_node*)& snmp
};

const struct mib_array_node mib2 = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	MIB2_GROUPS,
	mib2_ids,
	mib2_nodes
};

/* mgmt .1.3.6.1.2 */
const s32_t mgmt_ids[1] = { 1 };
struct mib_node* const mgmt_nodes[1] = { (struct mib_node*)& mib2 };
const struct mib_array_node mgmt = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	1,
	mgmt_ids,
	mgmt_nodes
};

/* internet .1.3.6.1 */
#if SNMP_PRIVATE_MIB
/* When using a private MIB, you have to create a file 'private_mib.h' that contains
 * a 'struct mib_array_node mib_private' which contains your MIB. */
s32_t internet_ids[2] = { 2, 4 };
struct mib_node* const internet_nodes[2] = { (struct mib_node*)& mgmt, (struct mib_node*)& mib_private };
const struct mib_array_node internet = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	2,
	internet_ids,
	internet_nodes
};
#else
const s32_t internet_ids[1] = { 2 };
struct mib_node* const internet_nodes[1] = { (struct mib_node*)& mgmt };
const struct mib_array_node internet = {
	&noleafs_get_object_def,
	&noleafs_get_value,
	&noleafs_set_test,
	&noleafs_set_value,
	MIB_NODE_AR,
	1,
	internet_ids,
	internet_nodes
};
#endif

/** mib-2.system.sysObjectID  */
static struct snmp_obj_id sysobjid = {SNMP_SYSOBJID_LEN, SNMP_SYSOBJID};
/** enterprise ID for generic TRAPs, .iso.org.dod.internet.mgmt.mib-2.snmp */
static struct snmp_obj_id snmpgrp_id = {7, {1, 3, 6, 1, 2, 1, 11}};
/** mib-2.system.sysServices */
static const s32_t sysservices = SNMP_SYSSERVICES;

/** mib-2.system.sysDescr */
static const u8_t sysdescr_len_default = 4;
static const u8_t sysdescr_default[] = "lwIP";
static u8_t* sysdescr_len_ptr = (u8_t*)& sysdescr_len_default;
static u8_t* sysdescr_ptr = (u8_t*)& sysdescr_default[0];
/** mib-2.system.sysContact */
static const u8_t syscontact_len_default = 0;
static const u8_t syscontact_default[] = "";
static u8_t* syscontact_len_ptr = (u8_t*)& syscontact_len_default;
static u8_t* syscontact_ptr = (u8_t*)& syscontact_default[0];
/** mib-2.system.sysName */
static const u8_t sysname_len_default = 8;
static const u8_t sysname_default[] = "FQDN-unk";
static u8_t* sysname_len_ptr = (u8_t*)& sysname_len_default;
static u8_t* sysname_ptr = (u8_t*)& sysname_default[0];
/** mib-2.system.sysLocation */
static const u8_t syslocation_len_default = 0;
static const u8_t syslocation_default[] = "";
static u8_t* syslocation_len_ptr = (u8_t*)& syslocation_len_default;
static u8_t* syslocation_ptr = (u8_t*)& syslocation_default[0];
/** mib-2.snmp.snmpEnableAuthenTraps */
static const u8_t snmpenableauthentraps_default = 2; /* disabled */
static u8_t* snmpenableauthentraps_ptr = (u8_t*)& snmpenableauthentraps_default;

/** mib-2.interfaces.ifTable.ifEntry.ifSpecific (zeroDotZero) */
static const struct snmp_obj_id ifspecific = {2, {0, 0}};
/** mib-2.ip.ipRouteTable.ipRouteEntry.ipRouteInfo (zeroDotZero) */
static const struct snmp_obj_id iprouteinfo = {2, {0, 0}};



/* mib-2.system counter(s) */
static u32_t sysuptime = 0;

/* mib-2.ip counter(s) */
static u32_t ipinreceives = 0,
             ipinhdrerrors = 0,
             ipinaddrerrors = 0,
             ipforwdatagrams = 0,
             ipinunknownprotos = 0,
             ipindiscards = 0,
             ipindelivers = 0,
             ipoutrequests = 0,
             ipoutdiscards = 0,
             ipoutnoroutes = 0,
             ipreasmreqds = 0,
             ipreasmoks = 0,
             ipreasmfails = 0,
             ipfragoks = 0,
             ipfragfails = 0,
             ipfragcreates = 0,
             iproutingdiscards = 0;
/* mib-2.icmp counter(s) */
static u32_t icmpinmsgs = 0,
             icmpinerrors = 0,
             icmpindestunreachs = 0,
             icmpintimeexcds = 0,
             icmpinparmprobs = 0,
             icmpinsrcquenchs = 0,
             icmpinredirects = 0,
             icmpinechos = 0,
             icmpinechoreps = 0,
             icmpintimestamps = 0,
             icmpintimestampreps = 0,
             icmpinaddrmasks = 0,
             icmpinaddrmaskreps = 0,
             icmpoutmsgs = 0,
             icmpouterrors = 0,
             icmpoutdestunreachs = 0,
             icmpouttimeexcds = 0,
             icmpoutparmprobs = 0,
             icmpoutsrcquenchs = 0,
             icmpoutredirects = 0,
             icmpoutechos = 0,
             icmpoutechoreps = 0,
             icmpouttimestamps = 0,
             icmpouttimestampreps = 0,
             icmpoutaddrmasks = 0,
             icmpoutaddrmaskreps = 0;
/* mib-2.tcp counter(s) */
static u32_t tcpactiveopens = 0,
             tcppassiveopens = 0,
             tcpattemptfails = 0,
             tcpestabresets = 0,
             tcpinsegs = 0,
             tcpoutsegs = 0,
             tcpretranssegs = 0,
             tcpinerrs = 0,
             tcpoutrsts = 0;
/* mib-2.udp counter(s) */
static u32_t udpindatagrams = 0,
             udpnoports = 0,
             udpinerrors = 0,
             udpoutdatagrams = 0;
/* mib-2.snmp counter(s) */
static u32_t snmpinpkts = 0,
             snmpoutpkts = 0,
             snmpinbadversions = 0,
             snmpinbadcommunitynames = 0,
             snmpinbadcommunityuses = 0,
             snmpinasnparseerrs = 0,
             snmpintoobigs = 0,
             snmpinnosuchnames = 0,
             snmpinbadvalues = 0,
             snmpinreadonlys = 0,
             snmpingenerrs = 0,
             snmpintotalreqvars = 0,
             snmpintotalsetvars = 0,
             snmpingetrequests = 0,
             snmpingetnexts = 0,
             snmpinsetrequests = 0,
             snmpingetresponses = 0,
             snmpintraps = 0,
             snmpouttoobigs = 0,
             snmpoutnosuchnames = 0,
             snmpoutbadvalues = 0,
             snmpoutgenerrs = 0,
             snmpoutgetrequests = 0,
             snmpoutgetnexts = 0,
             snmpoutsetrequests = 0,
             snmpoutgetresponses = 0,
             snmpouttraps = 0;



/* prototypes of the following functions are in lwip/src/include/lwip/snmp.h */
/**
 * Copy octet string.
 *
 * @param dst points to destination
 * @param src points to source
 * @param n number of octets to copy.
 */
static void ocstrncpy(u8_t* dst, u8_t* src, u16_t n)
{
	u16_t i = n;

	while(i > 0) {
		i--;
		*dst++ = *src++;
	}
}

/**
 * Copy object identifier (s32_t) array.
 *
 * @param dst points to destination
 * @param src points to source
 * @param n number of sub identifiers to copy.
 */
void objectidncpy(s32_t* dst, s32_t* src, u8_t n)
{
	u8_t i = n;

	while(i > 0) {
		i--;
		*dst++ = *src++;
	}
}

/**
 * Initializes sysDescr pointers.
 *
 * @param str if non-NULL then copy str pointer
 * @param len points to string length, excluding zero terminator
 */
void snmp_set_sysdesr(u8_t* str, u8_t* len)
{
	if(str != NULL) {
		sysdescr_ptr = str;
		sysdescr_len_ptr = len;
	}
}

void snmp_get_sysobjid_ptr(struct snmp_obj_id** oid)
{
	*oid = &sysobjid;
}

/**
 * Initializes sysObjectID value.
 *
 * @param oid points to stuct snmp_obj_id to copy
 */
void snmp_set_sysobjid(struct snmp_obj_id* oid)
{
	sysobjid = *oid;
}

/**
 * Must be called at regular 10 msec interval from a timer interrupt
 * or signal handler depending on your runtime environment.
 */
void snmp_inc_sysuptime(void)
{
	sysuptime++;
}

void snmp_add_sysuptime(u32_t value)
{
	sysuptime += value;
}

void snmp_get_sysuptime(u32_t* value)
{
	SNMP_GET_SYSUPTIME(sysuptime);
	*value = sysuptime;
}

/**
 * Initializes sysContact pointers,
 * e.g. ptrs to non-volatile memory external to lwIP.
 *
 * @param ocstr if non-NULL then copy str pointer
 * @param ocstrlen points to string length, excluding zero terminator
 */
void snmp_set_syscontact(u8_t* ocstr, u8_t* ocstrlen)
{
	if(ocstr != NULL) {
		syscontact_ptr = ocstr;
		syscontact_len_ptr = ocstrlen;
	}
}

/**
 * Initializes sysName pointers,
 * e.g. ptrs to non-volatile memory external to lwIP.
 *
 * @param ocstr if non-NULL then copy str pointer
 * @param ocstrlen points to string length, excluding zero terminator
 */
void snmp_set_sysname(u8_t* ocstr, u8_t* ocstrlen)
{
	if(ocstr != NULL) {
		sysname_ptr = ocstr;
		sysname_len_ptr = ocstrlen;
	}
}

/**
 * Initializes sysLocation pointers,
 * e.g. ptrs to non-volatile memory external to lwIP.
 *
 * @param ocstr if non-NULL then copy str pointer
 * @param ocstrlen points to string length, excluding zero terminator
 */
void snmp_set_syslocation(u8_t* ocstr, u8_t* ocstrlen)
{
	if(ocstr != NULL) {
		syslocation_ptr = ocstr;
		syslocation_len_ptr = ocstrlen;
	}
}


void snmp_add_ifinoctets(struct netif* ni, u32_t value)
{
	ni->ifinoctets += value;
}

void snmp_inc_ifinucastpkts(struct netif* ni)
{
	(ni->ifinucastpkts)++;
}

void snmp_inc_ifinnucastpkts(struct netif* ni)
{
	(ni->ifinnucastpkts)++;
}

void snmp_inc_ifindiscards(struct netif* ni)
{
	(ni->ifindiscards)++;
}

void snmp_add_ifoutoctets(struct netif* ni, u32_t value)
{
	ni->ifoutoctets += value;
}

void snmp_inc_ifoutucastpkts(struct netif* ni)
{
	(ni->ifoutucastpkts)++;
}

void snmp_inc_ifoutnucastpkts(struct netif* ni)
{
	(ni->ifoutnucastpkts)++;
}

void snmp_inc_ifoutdiscards(struct netif* ni)
{
	(ni->ifoutdiscards)++;
}

void snmp_inc_iflist(void)
{
	struct mib_list_node* if_node = NULL;

	snmp_mib_node_insert(&iflist_root, iflist_root.count + 1, &if_node);
	/* enable getnext traversal on filled table */
	iftable.maxlength = 1;
}

void snmp_dec_iflist(void)
{
	snmp_mib_node_delete(&iflist_root, iflist_root.tail);

	/* disable getnext traversal on empty table */
	if(iflist_root.count == 0) iftable.maxlength = 0;
}

/**
 * Inserts ARP table indexes (.xIfIndex.xNetAddress)
 * into arp table index trees (both atTable and ipNetToMediaTable).
 */
void snmp_insert_arpidx_tree(struct netif* ni, ip_addr_t* ip)
{
	struct mib_list_rootnode* at_rn;
	struct mib_list_node* at_node;
	s32_t arpidx[5];
	u8_t level, tree;

	LWIP_ASSERT("ni != NULL", ni != NULL);
	snmp_netiftoifindex(ni, &arpidx[0]);
	snmp_iptooid(ip, &arpidx[1]);

	for(tree = 0; tree < 2; tree++) {
		if(tree == 0) {
			at_rn = &arptree_root;
		} else {
			at_rn = &ipntomtree_root;
		}

		for(level = 0; level < 5; level++) {
			at_node = NULL;
			snmp_mib_node_insert(at_rn, arpidx[level], &at_node);

			if((level != 4) && (at_node != NULL)) {
				if(at_node->nptr == NULL) {
					at_rn = snmp_mib_lrn_alloc();
					at_node->nptr = (struct mib_node*)at_rn;

					if(at_rn != NULL) {
						if(level == 3) {
							if(tree == 0) {
								at_rn->get_object_def = atentry_get_object_def;
								at_rn->get_value = atentry_get_value;
							} else {
								at_rn->get_object_def = ip_ntomentry_get_object_def;
								at_rn->get_value = ip_ntomentry_get_value;
							}

							at_rn->set_test = noleafs_set_test;
							at_rn->set_value = noleafs_set_value;
						}
					} else {
						/* at_rn == NULL, malloc failure */
						LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_insert_arpidx_tree() insert failed, mem full"));
						break;
					}
				} else {
					at_rn = (struct mib_list_rootnode*)at_node->nptr;
				}
			}
		}
	}

	/* enable getnext traversal on filled tables */
	at.maxlength = 1;
	ipntomtable.maxlength = 1;
}

/**
 * Removes ARP table indexes (.xIfIndex.xNetAddress)
 * from arp table index trees.
 */
void snmp_delete_arpidx_tree(struct netif* ni, ip_addr_t* ip)
{
	struct mib_list_rootnode* at_rn, *next, *del_rn[5];
	struct mib_list_node* at_n, *del_n[5];
	s32_t arpidx[5];
	u8_t fc, tree, level, del_cnt;

	snmp_netiftoifindex(ni, &arpidx[0]);
	snmp_iptooid(ip, &arpidx[1]);

	for(tree = 0; tree < 2; tree++) {
		/* mark nodes for deletion */
		if(tree == 0) {
			at_rn = &arptree_root;
		} else {
			at_rn = &ipntomtree_root;
		}

		level = 0;
		del_cnt = 0;

		while((level < 5) && (at_rn != NULL)) {
			fc = snmp_mib_node_find(at_rn, arpidx[level], &at_n);

			if(fc == 0) {
				/* arpidx[level] does not exist */
				del_cnt = 0;
				at_rn = NULL;
			} else if(fc == 1) {
				del_rn[del_cnt] = at_rn;
				del_n[del_cnt] = at_n;
				del_cnt++;
				at_rn = (struct mib_list_rootnode*)(at_n->nptr);
			} else if(fc == 2) {
				/* reset delete (2 or more childs) */
				del_cnt = 0;
				at_rn = (struct mib_list_rootnode*)(at_n->nptr);
			}

			level++;
		}

		/* delete marked index nodes */
		while(del_cnt > 0) {
			del_cnt--;

			at_rn = del_rn[del_cnt];
			at_n = del_n[del_cnt];

			next = snmp_mib_node_delete(at_rn, at_n);

			if(next != NULL) {
				LWIP_ASSERT("next_count == 0", next->count == 0);
				snmp_mib_lrn_free(next);
			}
		}
	}

	/* disable getnext traversal on empty tables */
	if(arptree_root.count == 0) at.maxlength = 0;

	if(ipntomtree_root.count == 0) ipntomtable.maxlength = 0;
}

void snmp_inc_ipinreceives(void)
{
	ipinreceives++;
}

void snmp_inc_ipinhdrerrors(void)
{
	ipinhdrerrors++;
}

void snmp_inc_ipinaddrerrors(void)
{
	ipinaddrerrors++;
}

void snmp_inc_ipforwdatagrams(void)
{
	ipforwdatagrams++;
}

void snmp_inc_ipinunknownprotos(void)
{
	ipinunknownprotos++;
}

void snmp_inc_ipindiscards(void)
{
	ipindiscards++;
}

void snmp_inc_ipindelivers(void)
{
	ipindelivers++;
}

void snmp_inc_ipoutrequests(void)
{
	ipoutrequests++;
}

void snmp_inc_ipoutdiscards(void)
{
	ipoutdiscards++;
}

void snmp_inc_ipoutnoroutes(void)
{
	ipoutnoroutes++;
}

void snmp_inc_ipreasmreqds(void)
{
	ipreasmreqds++;
}

void snmp_inc_ipreasmoks(void)
{
	ipreasmoks++;
}

void snmp_inc_ipreasmfails(void)
{
	ipreasmfails++;
}

void snmp_inc_ipfragoks(void)
{
	ipfragoks++;
}

void snmp_inc_ipfragfails(void)
{
	ipfragfails++;
}

void snmp_inc_ipfragcreates(void)
{
	ipfragcreates++;
}

void snmp_inc_iproutingdiscards(void)
{
	iproutingdiscards++;
}

/**
 * Inserts ipAddrTable indexes (.ipAdEntAddr)
 * into index tree.
 */
void snmp_insert_ipaddridx_tree(struct netif* ni)
{
	struct mib_list_rootnode* ipa_rn;
	struct mib_list_node* ipa_node;
	s32_t ipaddridx[4];
	u8_t level;

	LWIP_ASSERT("ni != NULL", ni != NULL);
	snmp_iptooid(&ni->ip_addr, &ipaddridx[0]);

	level = 0;
	ipa_rn = &ipaddrtree_root;

	while(level < 4) {
		ipa_node = NULL;
		snmp_mib_node_insert(ipa_rn, ipaddridx[level], &ipa_node);

		if((level != 3) && (ipa_node != NULL)) {
			if(ipa_node->nptr == NULL) {
				ipa_rn = snmp_mib_lrn_alloc();
				ipa_node->nptr = (struct mib_node*)ipa_rn;

				if(ipa_rn != NULL) {
					if(level == 2) {
						ipa_rn->get_object_def = ip_addrentry_get_object_def;
						ipa_rn->get_value = ip_addrentry_get_value;
						ipa_rn->set_test = noleafs_set_test;
						ipa_rn->set_value = noleafs_set_value;
					}
				} else {
					/* ipa_rn == NULL, malloc failure */
					LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_insert_ipaddridx_tree() insert failed, mem full"));
					break;
				}
			} else {
				ipa_rn = (struct mib_list_rootnode*)ipa_node->nptr;
			}
		}

		level++;
	}

	/* enable getnext traversal on filled table */
	ipaddrtable.maxlength = 1;
}

/**
 * Removes ipAddrTable indexes (.ipAdEntAddr)
 * from index tree.
 */
void snmp_delete_ipaddridx_tree(struct netif* ni)
{
	struct mib_list_rootnode* ipa_rn, *next, *del_rn[4];
	struct mib_list_node* ipa_n, *del_n[4];
	s32_t ipaddridx[4];
	u8_t fc, level, del_cnt;

	LWIP_ASSERT("ni != NULL", ni != NULL);
	snmp_iptooid(&ni->ip_addr, &ipaddridx[0]);

	/* mark nodes for deletion */
	level = 0;
	del_cnt = 0;
	ipa_rn = &ipaddrtree_root;

	while((level < 4) && (ipa_rn != NULL)) {
		fc = snmp_mib_node_find(ipa_rn, ipaddridx[level], &ipa_n);

		if(fc == 0) {
			/* ipaddridx[level] does not exist */
			del_cnt = 0;
			ipa_rn = NULL;
		} else if(fc == 1) {
			del_rn[del_cnt] = ipa_rn;
			del_n[del_cnt] = ipa_n;
			del_cnt++;
			ipa_rn = (struct mib_list_rootnode*)(ipa_n->nptr);
		} else if(fc == 2) {
			/* reset delete (2 or more childs) */
			del_cnt = 0;
			ipa_rn = (struct mib_list_rootnode*)(ipa_n->nptr);
		}

		level++;
	}

	/* delete marked index nodes */
	while(del_cnt > 0) {
		del_cnt--;

		ipa_rn = del_rn[del_cnt];
		ipa_n = del_n[del_cnt];

		next = snmp_mib_node_delete(ipa_rn, ipa_n);

		if(next != NULL) {
			LWIP_ASSERT("next_count == 0", next->count == 0);
			snmp_mib_lrn_free(next);
		}
	}

	/* disable getnext traversal on empty table */
	if(ipaddrtree_root.count == 0) ipaddrtable.maxlength = 0;
}

/**
 * Inserts ipRouteTable indexes (.ipRouteDest)
 * into index tree.
 *
 * @param dflt non-zero for the default rte, zero for network rte
 * @param ni points to network interface for this rte
 *
 * @todo record sysuptime for _this_ route when it is installed
 *   (needed for ipRouteAge) in the netif.
 */
void snmp_insert_iprteidx_tree(u8_t dflt, struct netif* ni)
{
	u8_t insert = 0;
	ip_addr_t dst;

	if(dflt != 0) {
		/* the default route 0.0.0.0 */
		ip_addr_set_any(&dst);
		insert = 1;
	} else {
		/* route to the network address */
		ip_addr_get_network(&dst, &ni->ip_addr, &ni->netmask);

		/* exclude 0.0.0.0 network (reserved for default rte) */
		if(!ip_addr_isany(&dst)) {
			insert = 1;
		}
	}

	if(insert) {
		struct mib_list_rootnode* iprte_rn;
		struct mib_list_node* iprte_node;
		s32_t iprteidx[4];
		u8_t level;

		snmp_iptooid(&dst, &iprteidx[0]);
		level = 0;
		iprte_rn = &iprtetree_root;

		while(level < 4) {
			iprte_node = NULL;
			snmp_mib_node_insert(iprte_rn, iprteidx[level], &iprte_node);

			if((level != 3) && (iprte_node != NULL)) {
				if(iprte_node->nptr == NULL) {
					iprte_rn = snmp_mib_lrn_alloc();
					iprte_node->nptr = (struct mib_node*)iprte_rn;

					if(iprte_rn != NULL) {
						if(level == 2) {
							iprte_rn->get_object_def = ip_rteentry_get_object_def;
							iprte_rn->get_value = ip_rteentry_get_value;
							iprte_rn->set_test = noleafs_set_test;
							iprte_rn->set_value = noleafs_set_value;
						}
					} else {
						/* iprte_rn == NULL, malloc failure */
						LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_insert_iprteidx_tree() insert failed, mem full"));
						break;
					}
				} else {
					iprte_rn = (struct mib_list_rootnode*)iprte_node->nptr;
				}
			}

			level++;
		}
	}

	/* enable getnext traversal on filled table */
	iprtetable.maxlength = 1;
}

/**
 * Removes ipRouteTable indexes (.ipRouteDest)
 * from index tree.
 *
 * @param dflt non-zero for the default rte, zero for network rte
 * @param ni points to network interface for this rte or NULL
 *   for default route to be removed.
 */
void snmp_delete_iprteidx_tree(u8_t dflt, struct netif* ni)
{
	u8_t del = 0;
	ip_addr_t dst;

	if(dflt != 0) {
		/* the default route 0.0.0.0 */
		ip_addr_set_any(&dst);
		del = 1;
	} else {
		/* route to the network address */
		ip_addr_get_network(&dst, &ni->ip_addr, &ni->netmask);

		/* exclude 0.0.0.0 network (reserved for default rte) */
		if(!ip_addr_isany(&dst)) {
			del = 1;
		}
	}

	if(del) {
		struct mib_list_rootnode* iprte_rn, *next, *del_rn[4];
		struct mib_list_node* iprte_n, *del_n[4];
		s32_t iprteidx[4];
		u8_t fc, level, del_cnt;

		snmp_iptooid(&dst, &iprteidx[0]);
		/* mark nodes for deletion */
		level = 0;
		del_cnt = 0;
		iprte_rn = &iprtetree_root;

		while((level < 4) && (iprte_rn != NULL)) {
			fc = snmp_mib_node_find(iprte_rn, iprteidx[level], &iprte_n);

			if(fc == 0) {
				/* iprteidx[level] does not exist */
				del_cnt = 0;
				iprte_rn = NULL;
			} else if(fc == 1) {
				del_rn[del_cnt] = iprte_rn;
				del_n[del_cnt] = iprte_n;
				del_cnt++;
				iprte_rn = (struct mib_list_rootnode*)(iprte_n->nptr);
			} else if(fc == 2) {
				/* reset delete (2 or more childs) */
				del_cnt = 0;
				iprte_rn = (struct mib_list_rootnode*)(iprte_n->nptr);
			}

			level++;
		}

		/* delete marked index nodes */
		while(del_cnt > 0) {
			del_cnt--;

			iprte_rn = del_rn[del_cnt];
			iprte_n = del_n[del_cnt];

			next = snmp_mib_node_delete(iprte_rn, iprte_n);

			if(next != NULL) {
				LWIP_ASSERT("next_count == 0", next->count == 0);
				snmp_mib_lrn_free(next);
			}
		}
	}

	/* disable getnext traversal on empty table */
	if(iprtetree_root.count == 0) iprtetable.maxlength = 0;
}


void snmp_inc_icmpinmsgs(void)
{
	icmpinmsgs++;
}

void snmp_inc_icmpinerrors(void)
{
	icmpinerrors++;
}

void snmp_inc_icmpindestunreachs(void)
{
	icmpindestunreachs++;
}

void snmp_inc_icmpintimeexcds(void)
{
	icmpintimeexcds++;
}

void snmp_inc_icmpinparmprobs(void)
{
	icmpinparmprobs++;
}

void snmp_inc_icmpinsrcquenchs(void)
{
	icmpinsrcquenchs++;
}

void snmp_inc_icmpinredirects(void)
{
	icmpinredirects++;
}

void snmp_inc_icmpinechos(void)
{
	icmpinechos++;
}

void snmp_inc_icmpinechoreps(void)
{
	icmpinechoreps++;
}

void snmp_inc_icmpintimestamps(void)
{
	icmpintimestamps++;
}

void snmp_inc_icmpintimestampreps(void)
{
	icmpintimestampreps++;
}

void snmp_inc_icmpinaddrmasks(void)
{
	icmpinaddrmasks++;
}

void snmp_inc_icmpinaddrmaskreps(void)
{
	icmpinaddrmaskreps++;
}

void snmp_inc_icmpoutmsgs(void)
{
	icmpoutmsgs++;
}

void snmp_inc_icmpouterrors(void)
{
	icmpouterrors++;
}

void snmp_inc_icmpoutdestunreachs(void)
{
	icmpoutdestunreachs++;
}

void snmp_inc_icmpouttimeexcds(void)
{
	icmpouttimeexcds++;
}

void snmp_inc_icmpoutparmprobs(void)
{
	icmpoutparmprobs++;
}

void snmp_inc_icmpoutsrcquenchs(void)
{
	icmpoutsrcquenchs++;
}

void snmp_inc_icmpoutredirects(void)
{
	icmpoutredirects++;
}

void snmp_inc_icmpoutechos(void)
{
	icmpoutechos++;
}

void snmp_inc_icmpoutechoreps(void)
{
	icmpoutechoreps++;
}

void snmp_inc_icmpouttimestamps(void)
{
	icmpouttimestamps++;
}

void snmp_inc_icmpouttimestampreps(void)
{
	icmpouttimestampreps++;
}

void snmp_inc_icmpoutaddrmasks(void)
{
	icmpoutaddrmasks++;
}

void snmp_inc_icmpoutaddrmaskreps(void)
{
	icmpoutaddrmaskreps++;
}

void snmp_inc_tcpactiveopens(void)
{
	tcpactiveopens++;
}

void snmp_inc_tcppassiveopens(void)
{
	tcppassiveopens++;
}

void snmp_inc_tcpattemptfails(void)
{
	tcpattemptfails++;
}

void snmp_inc_tcpestabresets(void)
{
	tcpestabresets++;
}

void snmp_inc_tcpinsegs(void)
{
	tcpinsegs++;
}

void snmp_inc_tcpoutsegs(void)
{
	tcpoutsegs++;
}

void snmp_inc_tcpretranssegs(void)
{
	tcpretranssegs++;
}

void snmp_inc_tcpinerrs(void)
{
	tcpinerrs++;
}

void snmp_inc_tcpoutrsts(void)
{
	tcpoutrsts++;
}

void snmp_inc_udpindatagrams(void)
{
	udpindatagrams++;
}

void snmp_inc_udpnoports(void)
{
	udpnoports++;
}

void snmp_inc_udpinerrors(void)
{
	udpinerrors++;
}

void snmp_inc_udpoutdatagrams(void)
{
	udpoutdatagrams++;
}

/**
 * Inserts udpTable indexes (.udpLocalAddress.udpLocalPort)
 * into index tree.
 */
void snmp_insert_udpidx_tree(struct udp_pcb* pcb)
{
	struct mib_list_rootnode* udp_rn;
	struct mib_list_node* udp_node;
	s32_t udpidx[5];
	u8_t level;

	LWIP_ASSERT("pcb != NULL", pcb != NULL);
	snmp_iptooid(&pcb->local_ip, &udpidx[0]);
	udpidx[4] = pcb->local_port;

	udp_rn = &udp_root;

	for(level = 0; level < 5; level++) {
		udp_node = NULL;
		snmp_mib_node_insert(udp_rn, udpidx[level], &udp_node);

		if((level != 4) && (udp_node != NULL)) {
			if(udp_node->nptr == NULL) {
				udp_rn = snmp_mib_lrn_alloc();
				udp_node->nptr = (struct mib_node*)udp_rn;

				if(udp_rn != NULL) {
					if(level == 3) {
						udp_rn->get_object_def = udpentry_get_object_def;
						udp_rn->get_value = udpentry_get_value;
						udp_rn->set_test = noleafs_set_test;
						udp_rn->set_value = noleafs_set_value;
					}
				} else {
					/* udp_rn == NULL, malloc failure */
					LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_insert_udpidx_tree() insert failed, mem full"));
					break;
				}
			} else {
				udp_rn = (struct mib_list_rootnode*)udp_node->nptr;
			}
		}
	}

	udptable.maxlength = 1;
}

/**
 * Removes udpTable indexes (.udpLocalAddress.udpLocalPort)
 * from index tree.
 */
void snmp_delete_udpidx_tree(struct udp_pcb* pcb)
{
	struct udp_pcb* npcb;
	struct mib_list_rootnode* udp_rn, *next, *del_rn[5];
	struct mib_list_node* udp_n, *del_n[5];
	s32_t udpidx[5];
	u8_t bindings, fc, level, del_cnt;

	LWIP_ASSERT("pcb != NULL", pcb != NULL);
	snmp_iptooid(&pcb->local_ip, &udpidx[0]);
	udpidx[4] = pcb->local_port;

	/* count PCBs for a given binding
	   (e.g. when reusing ports or for temp output PCBs) */
	bindings = 0;
	npcb = udp_pcbs;

	while((npcb != NULL)) {
		if(ip_addr_cmp(&npcb->local_ip, &pcb->local_ip) &&
		        (npcb->local_port == udpidx[4])) {
			bindings++;
		}

		npcb = npcb->next;
	}

	if(bindings == 1) {
		/* selectively remove */
		/* mark nodes for deletion */
		level = 0;
		del_cnt = 0;
		udp_rn = &udp_root;

		while((level < 5) && (udp_rn != NULL)) {
			fc = snmp_mib_node_find(udp_rn, udpidx[level], &udp_n);

			if(fc == 0) {
				/* udpidx[level] does not exist */
				del_cnt = 0;
				udp_rn = NULL;
			} else if(fc == 1) {
				del_rn[del_cnt] = udp_rn;
				del_n[del_cnt] = udp_n;
				del_cnt++;
				udp_rn = (struct mib_list_rootnode*)(udp_n->nptr);
			} else if(fc == 2) {
				/* reset delete (2 or more childs) */
				del_cnt = 0;
				udp_rn = (struct mib_list_rootnode*)(udp_n->nptr);
			}

			level++;
		}

		/* delete marked index nodes */
		while(del_cnt > 0) {
			del_cnt--;

			udp_rn = del_rn[del_cnt];
			udp_n = del_n[del_cnt];

			next = snmp_mib_node_delete(udp_rn, udp_n);

			if(next != NULL) {
				LWIP_ASSERT("next_count == 0", next->count == 0);
				snmp_mib_lrn_free(next);
			}
		}
	}

	/* disable getnext traversal on empty table */
	if(udp_root.count == 0) udptable.maxlength = 0;
}


void snmp_inc_snmpinpkts(void)
{
	snmpinpkts++;
}

void snmp_inc_snmpoutpkts(void)
{
	snmpoutpkts++;
}

void snmp_inc_snmpinbadversions(void)
{
	snmpinbadversions++;
}

void snmp_inc_snmpinbadcommunitynames(void)
{
	snmpinbadcommunitynames++;
}

void snmp_inc_snmpinbadcommunityuses(void)
{
	snmpinbadcommunityuses++;
}

void snmp_inc_snmpinasnparseerrs(void)
{
	snmpinasnparseerrs++;
}

void snmp_inc_snmpintoobigs(void)
{
	snmpintoobigs++;
}

void snmp_inc_snmpinnosuchnames(void)
{
	snmpinnosuchnames++;
}

void snmp_inc_snmpinbadvalues(void)
{
	snmpinbadvalues++;
}

void snmp_inc_snmpinreadonlys(void)
{
	snmpinreadonlys++;
}

void snmp_inc_snmpingenerrs(void)
{
	snmpingenerrs++;
}

void snmp_add_snmpintotalreqvars(u8_t value)
{
	snmpintotalreqvars += value;
}

void snmp_add_snmpintotalsetvars(u8_t value)
{
	snmpintotalsetvars += value;
}

void snmp_inc_snmpingetrequests(void)
{
	snmpingetrequests++;
}

void snmp_inc_snmpingetnexts(void)
{
	snmpingetnexts++;
}

void snmp_inc_snmpinsetrequests(void)
{
	snmpinsetrequests++;
}

void snmp_inc_snmpingetresponses(void)
{
	snmpingetresponses++;
}

void snmp_inc_snmpintraps(void)
{
	snmpintraps++;
}

void snmp_inc_snmpouttoobigs(void)
{
	snmpouttoobigs++;
}

void snmp_inc_snmpoutnosuchnames(void)
{
	snmpoutnosuchnames++;
}

void snmp_inc_snmpoutbadvalues(void)
{
	snmpoutbadvalues++;
}

void snmp_inc_snmpoutgenerrs(void)
{
	snmpoutgenerrs++;
}

void snmp_inc_snmpoutgetrequests(void)
{
	snmpoutgetrequests++;
}

void snmp_inc_snmpoutgetnexts(void)
{
	snmpoutgetnexts++;
}

void snmp_inc_snmpoutsetrequests(void)
{
	snmpoutsetrequests++;
}

void snmp_inc_snmpoutgetresponses(void)
{
	snmpoutgetresponses++;
}

void snmp_inc_snmpouttraps(void)
{
	snmpouttraps++;
}

void snmp_get_snmpgrpid_ptr(struct snmp_obj_id** oid)
{
	*oid = &snmpgrp_id;
}

void snmp_set_snmpenableauthentraps(u8_t* value)
{
	if(value != NULL) {
		snmpenableauthentraps_ptr = value;
	}
}

void snmp_get_snmpenableauthentraps(u8_t* value)
{
	*value = *snmpenableauthentraps_ptr;
}

void
noleafs_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	LWIP_UNUSED_ARG(ident_len);
	LWIP_UNUSED_ARG(ident);
	od->instance = MIB_OBJECT_NONE;
}

void
noleafs_get_value(struct obj_def* od, u16_t len, void* value)
{
	LWIP_UNUSED_ARG(od);
	LWIP_UNUSED_ARG(len);
	LWIP_UNUSED_ARG(value);
}

u8_t
noleafs_set_test(struct obj_def* od, u16_t len, void* value)
{
	LWIP_UNUSED_ARG(od);
	LWIP_UNUSED_ARG(len);
	LWIP_UNUSED_ARG(value);
	/* can't set */
	return 0;
}

void
noleafs_set_value(struct obj_def* od, u16_t len, void* value)
{
	LWIP_UNUSED_ARG(od);
	LWIP_UNUSED_ARG(len);
	LWIP_UNUSED_ARG(value);
}


/**
 * Returns systems object definitions.
 *
 * @param ident_len the address length (2)
 * @param ident points to objectname.0 (object id trailer)
 * @param od points to object definition.
 */
static void
system_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	u8_t id;

	/* return to object name, adding index depth (1) */
	ident_len += 1;
	ident -= 1;

	if(ident_len == 2) {
		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		LWIP_ASSERT("invalid id", (ident[0] >= 0) && (ident[0] <= 0xff));
		id = (u8_t)ident[0];
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("get_object_def system.%"U16_F".0\n", (u16_t)id));

		switch(id) {
			case 1: /* sysDescr */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
				od->v_len = *sysdescr_len_ptr;
				break;

			case 2: /* sysObjectID */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID);
				od->v_len = sysobjid.len * sizeof(s32_t);
				break;

			case 3: /* sysUpTime */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS);
				od->v_len = sizeof(u32_t);
				break;

			case 4: /* sysContact */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
				od->v_len = *syscontact_len_ptr;
				break;

			case 5: /* sysName */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
				od->v_len = *sysname_len_ptr;
				break;

			case 6: /* sysLocation */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
				od->v_len = *syslocation_len_ptr;
				break;

			case 7: /* sysServices */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			default:
				LWIP_DEBUGF(SNMP_MIB_DEBUG, ("system_get_object_def: no such object\n"));
				od->instance = MIB_OBJECT_NONE;
				break;
		};
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("system_get_object_def: no scalar\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

/**
 * Returns system object value.
 *
 * @param ident_len the address length (2)
 * @param ident points to objectname.0 (object id trailer)
 * @param len return value space (in bytes)
 * @param value points to (varbind) space to copy value into.
 */
static void
system_get_value(struct obj_def* od, u16_t len, void* value)
{
	u8_t id;

	LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
	id = (u8_t)od->id_inst_ptr[0];

	switch(id) {
		case 1: /* sysDescr */
			ocstrncpy((u8_t*)value, sysdescr_ptr, len);
			break;

		case 2: /* sysObjectID */
			objectidncpy((s32_t*)value, (s32_t*)sysobjid.id, (u8_t)(len / sizeof(s32_t)));
			break;

		case 3: { /* sysUpTime */
			snmp_get_sysuptime((u32_t*)value);
		}
		break;

		case 4: /* sysContact */
			ocstrncpy((u8_t*)value, syscontact_ptr, len);
			break;

		case 5: /* sysName */
			ocstrncpy((u8_t*)value, sysname_ptr, len);
			break;

		case 6: /* sysLocation */
			ocstrncpy((u8_t*)value, syslocation_ptr, len);
			break;

		case 7: { /* sysServices */
			s32_t* sint_ptr = (s32_t*)value;
			*sint_ptr = sysservices;
		}
		break;
	};
}

static u8_t
system_set_test(struct obj_def* od, u16_t len, void* value)
{
	u8_t id, set_ok;

	LWIP_UNUSED_ARG(value);
	set_ok = 0;
	LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
	id = (u8_t)od->id_inst_ptr[0];

	switch(id) {
		case 4: /* sysContact */
			if((syscontact_ptr != syscontact_default) &&
			        (len <= 255)) {
				set_ok = 1;
			}

			break;

		case 5: /* sysName */
			if((sysname_ptr != sysname_default) &&
			        (len <= 255)) {
				set_ok = 1;
			}

			break;

		case 6: /* sysLocation */
			if((syslocation_ptr != syslocation_default) &&
			        (len <= 255)) {
				set_ok = 1;
			}

			break;
	};

	return set_ok;
}

static void
system_set_value(struct obj_def* od, u16_t len, void* value)
{
	u8_t id;

	LWIP_ASSERT("invalid len", len <= 0xff);
	LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
	id = (u8_t)od->id_inst_ptr[0];

	switch(id) {
		case 4: /* sysContact */
			ocstrncpy(syscontact_ptr, (u8_t*)value, len);
			*syscontact_len_ptr = (u8_t)len;
			break;

		case 5: /* sysName */
			ocstrncpy(sysname_ptr, (u8_t*)value, len);
			*sysname_len_ptr = (u8_t)len;
			break;

		case 6: /* sysLocation */
			ocstrncpy(syslocation_ptr, (u8_t*)value, len);
			*syslocation_len_ptr = (u8_t)len;
			break;
	};
}

/**
 * Returns interfaces.ifnumber object definition.
 *
 * @param ident_len the address length (2)
 * @param ident points to objectname.index
 * @param od points to object definition.
 */
static void
interfaces_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	/* return to object name, adding index depth (1) */
	ident_len += 1;
	ident -= 1;

	if(ident_len == 2) {
		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		od->instance = MIB_OBJECT_SCALAR;
		od->access = MIB_OBJECT_READ_ONLY;
		od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
		od->v_len = sizeof(s32_t);
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("interfaces_get_object_def: no scalar\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

/**
 * Returns interfaces.ifnumber object value.
 *
 * @param ident_len the address length (2)
 * @param ident points to objectname.0 (object id trailer)
 * @param len return value space (in bytes)
 * @param value points to (varbind) space to copy value into.
 */
static void
interfaces_get_value(struct obj_def* od, u16_t len, void* value)
{
	LWIP_UNUSED_ARG(len);

	if(od->id_inst_ptr[0] == 1) {
		s32_t* sint_ptr = (s32_t*)value;
		*sint_ptr = iflist_root.count;
	}
}

/**
 * Returns ifentry object definitions.
 *
 * @param ident_len the address length (2)
 * @param ident points to objectname.index
 * @param od points to object definition.
 */
static void
ifentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	u8_t id;

	/* return to object name, adding index depth (1) */
	ident_len += 1;
	ident -= 1;

	if(ident_len == 2) {
		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		LWIP_ASSERT("invalid id", (ident[0] >= 0) && (ident[0] <= 0xff));
		id = (u8_t)ident[0];
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("get_object_def ifentry.%"U16_F"\n", (u16_t)id));

		switch(id) {
			case 1: /* ifIndex */
			case 3: /* ifType */
			case 4: /* ifMtu */
			case 8: /* ifOperStatus */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			case 2: /* ifDescr */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
				/** @todo this should be some sort of sizeof(struct netif.name) */
				od->v_len = 2;
				break;

			case 5: /* ifSpeed */
			case 21: /* ifOutQLen */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE);
				od->v_len = sizeof(u32_t);
				break;

			case 6: { /* ifPhysAddress */
				struct netif* netif;

				snmp_ifindextonetif(ident[1], &netif);
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
				od->v_len = netif->hwaddr_len;
			}
			break;

			case 7: /* ifAdminStatus */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			case 9: /* ifLastChange */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS);
				od->v_len = sizeof(u32_t);
				break;

			case 10: /* ifInOctets */
			case 11: /* ifInUcastPkts */
			case 12: /* ifInNUcastPkts */
			case 13: /* ifInDiscarts */
			case 14: /* ifInErrors */
			case 15: /* ifInUnkownProtos */
			case 16: /* ifOutOctets */
			case 17: /* ifOutUcastPkts */
			case 18: /* ifOutNUcastPkts */
			case 19: /* ifOutDiscarts */
			case 20: /* ifOutErrors */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER);
				od->v_len = sizeof(u32_t);
				break;

			case 22: /* ifSpecific */
				/** @note returning zeroDotZero (0.0) no media specific MIB support */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID);
				od->v_len = ifspecific.len * sizeof(s32_t);
				break;

			default:
				LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ifentry_get_object_def: no such object\n"));
				od->instance = MIB_OBJECT_NONE;
				break;
		};
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ifentry_get_object_def: no scalar\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

/**
 * Returns ifentry object value.
 *
 * @param ident_len the address length (2)
 * @param ident points to objectname.0 (object id trailer)
 * @param len return value space (in bytes)
 * @param value points to (varbind) space to copy value into.
 */
static void
ifentry_get_value(struct obj_def* od, u16_t len, void* value)
{
	struct netif* netif;
	u8_t id;

	snmp_ifindextonetif(od->id_inst_ptr[1], &netif);
	LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
	id = (u8_t)od->id_inst_ptr[0];

	switch(id) {
		case 1: { /* ifIndex */
			s32_t* sint_ptr = (s32_t*)value;
			*sint_ptr = od->id_inst_ptr[1];
		}
		break;

		case 2: /* ifDescr */
			ocstrncpy((u8_t*)value, (u8_t*)netif->name, len);
			break;

		case 3: { /* ifType */
			s32_t* sint_ptr = (s32_t*)value;
			*sint_ptr = netif->link_type;
		}
		break;

		case 4: { /* ifMtu */
			s32_t* sint_ptr = (s32_t*)value;
			*sint_ptr = netif->mtu;
		}
		break;

		case 5: { /* ifSpeed */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = netif->link_speed;
		}
		break;

		case 6: /* ifPhysAddress */
			ocstrncpy((u8_t*)value, netif->hwaddr, len);
			break;

		case 7: { /* ifAdminStatus */
			s32_t* sint_ptr = (s32_t*)value;

			if(netif_is_up(netif)) {
				if(netif_is_link_up(netif)) {
					*sint_ptr = 1; /* up */
				} else {
					*sint_ptr = 7; /* lowerLayerDown */
				}
			} else {
				*sint_ptr = 2; /* down */
			}
		}
		break;

		case 8: { /* ifOperStatus */
			s32_t* sint_ptr = (s32_t*)value;

			if(netif_is_up(netif)) {
				*sint_ptr = 1;
			} else {
				*sint_ptr = 2;
			}
		}
		break;

		case 9: { /* ifLastChange */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = netif->ts;
		}
		break;

		case 10: { /* ifInOctets */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = netif->ifinoctets;
		}
		break;

		case 11: { /* ifInUcastPkts */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = netif->ifinucastpkts;
		}
		break;

		case 12: { /* ifInNUcastPkts */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = netif->ifinnucastpkts;
		}
		break;

		case 13: { /* ifInDiscarts */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = netif->ifindiscards;
		}
		break;

		case 14: /* ifInErrors */
		case 15: /* ifInUnkownProtos */
			/** @todo add these counters! */
		{
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = 0;
		}
		break;

		case 16: { /* ifOutOctets */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = netif->ifoutoctets;
		}
		break;

		case 17: { /* ifOutUcastPkts */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = netif->ifoutucastpkts;
		}
		break;

		case 18: { /* ifOutNUcastPkts */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = netif->ifoutnucastpkts;
		}
		break;

		case 19: { /* ifOutDiscarts */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = netif->ifoutdiscards;
		}
		break;

		case 20: /* ifOutErrors */
			/** @todo add this counter! */
		{
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = 0;
		}
		break;

		case 21: /* ifOutQLen */
			/** @todo figure out if this must be 0 (no queue) or 1? */
		{
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = 0;
		}
		break;

		case 22: /* ifSpecific */
			objectidncpy((s32_t*)value, (s32_t*)ifspecific.id, (u8_t)(len / sizeof(s32_t)));
			break;
	};
}

#if !SNMP_SAFE_REQUESTS
static u8_t
ifentry_set_test(struct obj_def* od, u16_t len, void* value)
{
	struct netif* netif;
	u8_t id, set_ok;
	LWIP_UNUSED_ARG(len);

	set_ok = 0;
	snmp_ifindextonetif(od->id_inst_ptr[1], &netif);
	id = (u8_t)od->id_inst_ptr[0];

	switch(id) {
		case 7: { /* ifAdminStatus */
			s32_t* sint_ptr = (s32_t*)value;

			if(*sint_ptr == 1 || *sint_ptr == 2)
				set_ok = 1;
		}
		break;
	}

	return set_ok;
}

static void
ifentry_set_value(struct obj_def* od, u16_t len, void* value)
{
	struct netif* netif;
	u8_t id;
	LWIP_UNUSED_ARG(len);

	snmp_ifindextonetif(od->id_inst_ptr[1], &netif);
	id = (u8_t)od->id_inst_ptr[0];

	switch(id) {
		case 7: { /* ifAdminStatus */
			s32_t* sint_ptr = (s32_t*)value;

			if(*sint_ptr == 1) {
				netif_set_up(netif);
			} else if(*sint_ptr == 2) {
				netif_set_down(netif);
			}
		}
		break;
	}
}
#endif /* SNMP_SAFE_REQUESTS */

/**
 * Returns atentry object definitions.
 *
 * @param ident_len the address length (6)
 * @param ident points to objectname.atifindex.atnetaddress
 * @param od points to object definition.
 */
static void
atentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	/* return to object name, adding index depth (5) */
	ident_len += 5;
	ident -= 5;

	if(ident_len == 6) {
		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		switch(ident[0]) {
			case 1: /* atIfIndex */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			case 2: /* atPhysAddress */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
				od->v_len = 6; /** @todo try to use netif::hwaddr_len */
				break;

			case 3: /* atNetAddress */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR);
				od->v_len = 4;
				break;

			default:
				LWIP_DEBUGF(SNMP_MIB_DEBUG, ("atentry_get_object_def: no such object\n"));
				od->instance = MIB_OBJECT_NONE;
				break;
		}
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("atentry_get_object_def: no scalar\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

static void
atentry_get_value(struct obj_def* od, u16_t len, void* value)
{
#if LWIP_ARP
	u8_t id;
	struct eth_addr* ethaddr_ret;
	ip_addr_t* ipaddr_ret;
#endif /* LWIP_ARP */
	ip_addr_t ip;
	struct netif* netif;

	LWIP_UNUSED_ARG(len);
	LWIP_UNUSED_ARG(value);/* if !LWIP_ARP */

	snmp_ifindextonetif(od->id_inst_ptr[1], &netif);
	snmp_oidtoip(&od->id_inst_ptr[2], &ip);

#if LWIP_ARP /** @todo implement a netif_find_addr */

	if(etharp_find_addr(netif, &ip, &ethaddr_ret, &ipaddr_ret) > -1) {
		LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
		id = (u8_t)od->id_inst_ptr[0];

		switch(id) {
			case 1: { /* atIfIndex */
				s32_t* sint_ptr = (s32_t*)value;
				*sint_ptr = od->id_inst_ptr[1];
			}
			break;

			case 2: { /* atPhysAddress */
				struct eth_addr* dst = (struct eth_addr*)value;

				*dst = *ethaddr_ret;
			}
			break;

			case 3: { /* atNetAddress */
				ip_addr_t* dst = (ip_addr_t*)value;

				*dst = *ipaddr_ret;
			}
			break;
		}
	}

#endif /* LWIP_ARP */
}

static void
ip_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	u8_t id;

	/* return to object name, adding index depth (1) */
	ident_len += 1;
	ident -= 1;

	if(ident_len == 2) {
		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		LWIP_ASSERT("invalid id", (ident[0] >= 0) && (ident[0] <= 0xff));
		id = (u8_t)ident[0];
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("get_object_def ip.%"U16_F".0\n", (u16_t)id));

		switch(id) {
			case 1: /* ipForwarding */
			case 2: /* ipDefaultTTL */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			case 3: /* ipInReceives */
			case 4: /* ipInHdrErrors */
			case 5: /* ipInAddrErrors */
			case 6: /* ipForwDatagrams */
			case 7: /* ipInUnknownProtos */
			case 8: /* ipInDiscards */
			case 9: /* ipInDelivers */
			case 10: /* ipOutRequests */
			case 11: /* ipOutDiscards */
			case 12: /* ipOutNoRoutes */
			case 14: /* ipReasmReqds */
			case 15: /* ipReasmOKs */
			case 16: /* ipReasmFails */
			case 17: /* ipFragOKs */
			case 18: /* ipFragFails */
			case 19: /* ipFragCreates */
			case 23: /* ipRoutingDiscards */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER);
				od->v_len = sizeof(u32_t);
				break;

			case 13: /* ipReasmTimeout */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			default:
				LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_get_object_def: no such object\n"));
				od->instance = MIB_OBJECT_NONE;
				break;
		};
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_get_object_def: no scalar\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

static void
ip_get_value(struct obj_def* od, u16_t len, void* value)
{
	u8_t id;

	LWIP_UNUSED_ARG(len);
	LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
	id = (u8_t)od->id_inst_ptr[0];

	switch(id) {
		case 1: { /* ipForwarding */
			s32_t* sint_ptr = (s32_t*)value;
#if IP_FORWARD
			/* forwarding */
			*sint_ptr = 1;
#else
			/* not-forwarding */
			*sint_ptr = 2;
#endif
		}
		break;

		case 2: { /* ipDefaultTTL */
			s32_t* sint_ptr = (s32_t*)value;
			*sint_ptr = IP_DEFAULT_TTL;
		}
		break;

		case 3: { /* ipInReceives */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipinreceives;
		}
		break;

		case 4: { /* ipInHdrErrors */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipinhdrerrors;
		}
		break;

		case 5: { /* ipInAddrErrors */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipinaddrerrors;
		}
		break;

		case 6: { /* ipForwDatagrams */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipforwdatagrams;
		}
		break;

		case 7: { /* ipInUnknownProtos */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipinunknownprotos;
		}
		break;

		case 8: { /* ipInDiscards */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipindiscards;
		}
		break;

		case 9: { /* ipInDelivers */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipindelivers;
		}
		break;

		case 10: { /* ipOutRequests */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipoutrequests;
		}
		break;

		case 11: { /* ipOutDiscards */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipoutdiscards;
		}
		break;

		case 12: { /* ipOutNoRoutes */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipoutnoroutes;
		}
		break;

		case 13: { /* ipReasmTimeout */
			s32_t* sint_ptr = (s32_t*)value;
#if IP_REASSEMBLY
			*sint_ptr = IP_REASS_MAXAGE;
#else
			*sint_ptr = 0;
#endif
		}
		break;

		case 14: { /* ipReasmReqds */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipreasmreqds;
		}
		break;

		case 15: { /* ipReasmOKs */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipreasmoks;
		}
		break;

		case 16: { /* ipReasmFails */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipreasmfails;
		}
		break;

		case 17: { /* ipFragOKs */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipfragoks;
		}
		break;

		case 18: { /* ipFragFails */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipfragfails;
		}
		break;

		case 19: { /* ipFragCreates */
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = ipfragcreates;
		}
		break;

		case 23: /* ipRoutingDiscards */
			/** @todo can lwIP discard routes at all?? hardwire this to 0?? */
		{
			u32_t* uint_ptr = (u32_t*)value;
			*uint_ptr = iproutingdiscards;
		}
		break;
	};
}

/**
 * Test ip object value before setting.
 *
 * @param od is the object definition
 * @param len return value space (in bytes)
 * @param value points to (varbind) space to copy value from.
 *
 * @note we allow set if the value matches the hardwired value,
 *   otherwise return badvalue.
 */
static u8_t
ip_set_test(struct obj_def* od, u16_t len, void* value)
{
	u8_t id, set_ok;
	s32_t* sint_ptr = (s32_t*)value;

	LWIP_UNUSED_ARG(len);
	set_ok = 0;
	LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
	id = (u8_t)od->id_inst_ptr[0];

	switch(id) {
		case 1: /* ipForwarding */
#if IP_FORWARD

			/* forwarding */
			if(*sint_ptr == 1)
#else

			/* not-forwarding */
			if(*sint_ptr == 2)
#endif
			{
				set_ok = 1;
			}

			break;

		case 2: /* ipDefaultTTL */
			if(*sint_ptr == IP_DEFAULT_TTL) {
				set_ok = 1;
			}

			break;
	};

	return set_ok;
}

static void
ip_addrentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	/* return to object name, adding index depth (4) */
	ident_len += 4;
	ident -= 4;

	if(ident_len == 5) {
		u8_t id;

		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		LWIP_ASSERT("invalid id", (ident[0] >= 0) && (ident[0] <= 0xff));
		id = (u8_t)ident[0];

		switch(id) {
			case 1: /* ipAdEntAddr */
			case 3: /* ipAdEntNetMask */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR);
				od->v_len = 4;
				break;

			case 2: /* ipAdEntIfIndex */
			case 4: /* ipAdEntBcastAddr */
			case 5: /* ipAdEntReasmMaxSize */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			default:
				LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_addrentry_get_object_def: no such object\n"));
				od->instance = MIB_OBJECT_NONE;
				break;
		}
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_addrentry_get_object_def: no scalar\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

static void
ip_addrentry_get_value(struct obj_def* od, u16_t len, void* value)
{
	u8_t id;
	u16_t ifidx;
	ip_addr_t ip;
	struct netif* netif = netif_list;

	LWIP_UNUSED_ARG(len);
	snmp_oidtoip(&od->id_inst_ptr[1], &ip);
	ifidx = 0;

	while((netif != NULL) && !ip_addr_cmp(&ip, &netif->ip_addr)) {
		netif = netif->next;
		ifidx++;
	}

	if(netif != NULL) {
		LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
		id = (u8_t)od->id_inst_ptr[0];

		switch(id) {
			case 1: { /* ipAdEntAddr */
				ip_addr_t* dst = (ip_addr_t*)value;
				*dst = netif->ip_addr;
			}
			break;

			case 2: { /* ipAdEntIfIndex */
				s32_t* sint_ptr = (s32_t*)value;
				*sint_ptr = ifidx + 1;
			}
			break;

			case 3: { /* ipAdEntNetMask */
				ip_addr_t* dst = (ip_addr_t*)value;
				*dst = netif->netmask;
			}
			break;

			case 4: { /* ipAdEntBcastAddr */
				s32_t* sint_ptr = (s32_t*)value;

				/* lwIP oddity, there's no broadcast
				  address in the netif we can rely on */
				*sint_ptr = IPADDR_BROADCAST & 1;
			}
			break;

			case 5: { /* ipAdEntReasmMaxSize */
				s32_t* sint_ptr = (s32_t*)value;
#if IP_REASSEMBLY
				/* @todo The theoretical maximum is IP_REASS_MAX_PBUFS * size of the pbufs,
				 * but only if receiving one fragmented packet at a time.
				 * The current solution is to calculate for 2 simultaneous packets...
				 */
				*sint_ptr = (IP_HLEN + ((IP_REASS_MAX_PBUFS / 2) *
				                        (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN - IP_HLEN)));
#else
				/** @todo returning MTU would be a bad thing and
				   returning a wild guess like '576' isn't good either */
				*sint_ptr = 0;
#endif
			}
			break;
		}
	}
}

/**
 * @note
 * lwIP IP routing is currently using the network addresses in netif_list.
 * if no suitable network IP is found in netif_list, the default_netif is used.
 */
static void
ip_rteentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	u8_t id;

	/* return to object name, adding index depth (4) */
	ident_len += 4;
	ident -= 4;

	if(ident_len == 5) {
		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		LWIP_ASSERT("invalid id", (ident[0] >= 0) && (ident[0] <= 0xff));
		id = (u8_t)ident[0];

		switch(id) {
			case 1: /* ipRouteDest */
			case 7: /* ipRouteNextHop */
			case 11: /* ipRouteMask */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR);
				od->v_len = 4;
				break;

			case 2: /* ipRouteIfIndex */
			case 3: /* ipRouteMetric1 */
			case 4: /* ipRouteMetric2 */
			case 5: /* ipRouteMetric3 */
			case 6: /* ipRouteMetric4 */
			case 8: /* ipRouteType */
			case 10: /* ipRouteAge */
			case 12: /* ipRouteMetric5 */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			case 9: /* ipRouteProto */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			case 13: /* ipRouteInfo */
				/** @note returning zeroDotZero (0.0) no routing protocol specific MIB */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID);
				od->v_len = iprouteinfo.len * sizeof(s32_t);
				break;

			default:
				LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_rteentry_get_object_def: no such object\n"));
				od->instance = MIB_OBJECT_NONE;
				break;
		}
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_rteentry_get_object_def: no scalar\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

static void
ip_rteentry_get_value(struct obj_def* od, u16_t len, void* value)
{
	struct netif* netif;
	ip_addr_t dest;
	s32_t* ident;
	u8_t id;

	ident = od->id_inst_ptr;
	snmp_oidtoip(&ident[1], &dest);

	if(ip_addr_isany(&dest)) {
		/* ip_route() uses default netif for default route */
		netif = netif_default;
	} else {
		/* not using ip_route(), need exact match! */
		netif = netif_list;

		while((netif != NULL) &&
		        !ip_addr_netcmp(&dest, &(netif->ip_addr), &(netif->netmask))) {
			netif = netif->next;
		}
	}

	if(netif != NULL) {
		LWIP_ASSERT("invalid id", (ident[0] >= 0) && (ident[0] <= 0xff));
		id = (u8_t)ident[0];

		switch(id) {
			case 1: { /* ipRouteDest */
				ip_addr_t* dst = (ip_addr_t*)value;

				if(ip_addr_isany(&dest)) {
					/* default rte has 0.0.0.0 dest */
					ip_addr_set_zero(dst);
				} else {
					/* netifs have netaddress dest */
					ip_addr_get_network(dst, &netif->ip_addr, &netif->netmask);
				}
			}
			break;

			case 2: { /* ipRouteIfIndex */
				s32_t* sint_ptr = (s32_t*)value;

				snmp_netiftoifindex(netif, sint_ptr);
			}
			break;

			case 3: { /* ipRouteMetric1 */
				s32_t* sint_ptr = (s32_t*)value;

				if(ip_addr_isany(&dest)) {
					/* default rte has metric 1 */
					*sint_ptr = 1;
				} else {
					/* other rtes have metric 0 */
					*sint_ptr = 0;
				}
			}
			break;

			case 4: /* ipRouteMetric2 */
			case 5: /* ipRouteMetric3 */
			case 6: /* ipRouteMetric4 */
			case 12: { /* ipRouteMetric5 */
				s32_t* sint_ptr = (s32_t*)value;
				/* not used */
				*sint_ptr = -1;
			}
			break;

			case 7: { /* ipRouteNextHop */
				ip_addr_t* dst = (ip_addr_t*)value;

				if(ip_addr_isany(&dest)) {
					/* default rte: gateway */
					*dst = netif->gw;
				} else {
					/* other rtes: netif ip_addr  */
					*dst = netif->ip_addr;
				}
			}
			break;

			case 8: { /* ipRouteType */
				s32_t* sint_ptr = (s32_t*)value;

				if(ip_addr_isany(&dest)) {
					/* default rte is indirect */
					*sint_ptr = 4;
				} else {
					/* other rtes are direct */
					*sint_ptr = 3;
				}
			}
			break;

			case 9: { /* ipRouteProto */
				s32_t* sint_ptr = (s32_t*)value;
				/* locally defined routes */
				*sint_ptr = 2;
			}
			break;

			case 10: { /* ipRouteAge */
				s32_t* sint_ptr = (s32_t*)value;
				/** @todo (sysuptime - timestamp last change) / 100
				    @see snmp_insert_iprteidx_tree() */
				*sint_ptr = 0;
			}
			break;

			case 11: { /* ipRouteMask */
				ip_addr_t* dst = (ip_addr_t*)value;

				if(ip_addr_isany(&dest)) {
					/* default rte use 0.0.0.0 mask */
					ip_addr_set_zero(dst);
				} else {
					/* other rtes use netmask */
					*dst = netif->netmask;
				}
			}
			break;

			case 13: /* ipRouteInfo */
				objectidncpy((s32_t*)value, (s32_t*)iprouteinfo.id, (u8_t)(len / sizeof(s32_t)));
				break;
		}
	}
}

static void
ip_ntomentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	/* return to object name, adding index depth (5) */
	ident_len += 5;
	ident -= 5;

	if(ident_len == 6) {
		u8_t id;

		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		LWIP_ASSERT("invalid id", (ident[0] >= 0) && (ident[0] <= 0xff));
		id = (u8_t)ident[0];

		switch(id) {
			case 1: /* ipNetToMediaIfIndex */
			case 4: /* ipNetToMediaType */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			case 2: /* ipNetToMediaPhysAddress */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
				od->v_len = 6; /** @todo try to use netif::hwaddr_len */
				break;

			case 3: /* ipNetToMediaNetAddress */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR);
				od->v_len = 4;
				break;

			default:
				LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_ntomentry_get_object_def: no such object\n"));
				od->instance = MIB_OBJECT_NONE;
				break;
		}
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_ntomentry_get_object_def: no scalar\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

static void
ip_ntomentry_get_value(struct obj_def* od, u16_t len, void* value)
{
#if LWIP_ARP
	u8_t id;
	struct eth_addr* ethaddr_ret;
	ip_addr_t* ipaddr_ret;
#endif /* LWIP_ARP */
	ip_addr_t ip;
	struct netif* netif;

	LWIP_UNUSED_ARG(len);
	LWIP_UNUSED_ARG(value);/* if !LWIP_ARP */

	snmp_ifindextonetif(od->id_inst_ptr[1], &netif);
	snmp_oidtoip(&od->id_inst_ptr[2], &ip);

#if LWIP_ARP /** @todo implement a netif_find_addr */

	if(etharp_find_addr(netif, &ip, &ethaddr_ret, &ipaddr_ret) > -1) {
		LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
		id = (u8_t)od->id_inst_ptr[0];

		switch(id) {
			case 1: { /* ipNetToMediaIfIndex */
				s32_t* sint_ptr = (s32_t*)value;
				*sint_ptr = od->id_inst_ptr[1];
			}
			break;

			case 2: { /* ipNetToMediaPhysAddress */
				struct eth_addr* dst = (struct eth_addr*)value;

				*dst = *ethaddr_ret;
			}
			break;

			case 3: { /* ipNetToMediaNetAddress */
				ip_addr_t* dst = (ip_addr_t*)value;

				*dst = *ipaddr_ret;
			}
			break;

			case 4: { /* ipNetToMediaType */
				s32_t* sint_ptr = (s32_t*)value;
				/* dynamic (?) */
				*sint_ptr = 3;
			}
			break;
		}
	}

#endif /* LWIP_ARP */
}

static void
icmp_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	/* return to object name, adding index depth (1) */
	ident_len += 1;
	ident -= 1;

	if((ident_len == 2) &&
	        (ident[0] > 0) && (ident[0] < 27)) {
		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		od->instance = MIB_OBJECT_SCALAR;
		od->access = MIB_OBJECT_READ_ONLY;
		od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER);
		od->v_len = sizeof(u32_t);
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("icmp_get_object_def: no scalar\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

static void
icmp_get_value(struct obj_def* od, u16_t len, void* value)
{
	u32_t* uint_ptr = (u32_t*)value;
	u8_t id;

	LWIP_UNUSED_ARG(len);
	LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
	id = (u8_t)od->id_inst_ptr[0];

	switch(id) {
		case 1: /* icmpInMsgs */
			*uint_ptr = icmpinmsgs;
			break;

		case 2: /* icmpInErrors */
			*uint_ptr = icmpinerrors;
			break;

		case 3: /* icmpInDestUnreachs */
			*uint_ptr = icmpindestunreachs;
			break;

		case 4: /* icmpInTimeExcds */
			*uint_ptr = icmpintimeexcds;
			break;

		case 5: /* icmpInParmProbs */
			*uint_ptr = icmpinparmprobs;
			break;

		case 6: /* icmpInSrcQuenchs */
			*uint_ptr = icmpinsrcquenchs;
			break;

		case 7: /* icmpInRedirects */
			*uint_ptr = icmpinredirects;
			break;

		case 8: /* icmpInEchos */
			*uint_ptr = icmpinechos;
			break;

		case 9: /* icmpInEchoReps */
			*uint_ptr = icmpinechoreps;
			break;

		case 10: /* icmpInTimestamps */
			*uint_ptr = icmpintimestamps;
			break;

		case 11: /* icmpInTimestampReps */
			*uint_ptr = icmpintimestampreps;
			break;

		case 12: /* icmpInAddrMasks */
			*uint_ptr = icmpinaddrmasks;
			break;

		case 13: /* icmpInAddrMaskReps */
			*uint_ptr = icmpinaddrmaskreps;
			break;

		case 14: /* icmpOutMsgs */
			*uint_ptr = icmpoutmsgs;
			break;

		case 15: /* icmpOutErrors */
			*uint_ptr = icmpouterrors;
			break;

		case 16: /* icmpOutDestUnreachs */
			*uint_ptr = icmpoutdestunreachs;
			break;

		case 17: /* icmpOutTimeExcds */
			*uint_ptr = icmpouttimeexcds;
			break;

		case 18: /* icmpOutParmProbs */
			*uint_ptr = icmpoutparmprobs;
			break;

		case 19: /* icmpOutSrcQuenchs */
			*uint_ptr = icmpoutsrcquenchs;
			break;

		case 20: /* icmpOutRedirects */
			*uint_ptr = icmpoutredirects;
			break;

		case 21: /* icmpOutEchos */
			*uint_ptr = icmpoutechos;
			break;

		case 22: /* icmpOutEchoReps */
			*uint_ptr = icmpoutechoreps;
			break;

		case 23: /* icmpOutTimestamps */
			*uint_ptr = icmpouttimestamps;
			break;

		case 24: /* icmpOutTimestampReps */
			*uint_ptr = icmpouttimestampreps;
			break;

		case 25: /* icmpOutAddrMasks */
			*uint_ptr = icmpoutaddrmasks;
			break;

		case 26: /* icmpOutAddrMaskReps */
			*uint_ptr = icmpoutaddrmaskreps;
			break;
	}
}

#if LWIP_TCP
/** @todo tcp grp */
static void
tcp_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	u8_t id;

	/* return to object name, adding index depth (1) */
	ident_len += 1;
	ident -= 1;

	if(ident_len == 2) {
		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		LWIP_ASSERT("invalid id", (ident[0] >= 0) && (ident[0] <= 0xff));
		id = (u8_t)ident[0];
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("get_object_def tcp.%"U16_F".0\n", (u16_t)id));

		switch(id) {
			case 1: /* tcpRtoAlgorithm */
			case 2: /* tcpRtoMin */
			case 3: /* tcpRtoMax */
			case 4: /* tcpMaxConn */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			case 5: /* tcpActiveOpens */
			case 6: /* tcpPassiveOpens */
			case 7: /* tcpAttemptFails */
			case 8: /* tcpEstabResets */
			case 10: /* tcpInSegs */
			case 11: /* tcpOutSegs */
			case 12: /* tcpRetransSegs */
			case 14: /* tcpInErrs */
			case 15: /* tcpOutRsts */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER);
				od->v_len = sizeof(u32_t);
				break;

			case 9: /* tcpCurrEstab */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE);
				od->v_len = sizeof(u32_t);
				break;

			default:
				LWIP_DEBUGF(SNMP_MIB_DEBUG, ("tcp_get_object_def: no such object\n"));
				od->instance = MIB_OBJECT_NONE;
				break;
		};
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("tcp_get_object_def: no scalar\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

static void
tcp_get_value(struct obj_def* od, u16_t len, void* value)
{
	u32_t* uint_ptr = (u32_t*)value;
	s32_t* sint_ptr = (s32_t*)value;
	u8_t id;

	LWIP_UNUSED_ARG(len);
	LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
	id = (u8_t)od->id_inst_ptr[0];

	switch(id) {
		case 1: /* tcpRtoAlgorithm, vanj(4) */
			*sint_ptr = 4;
			break;

		case 2: /* tcpRtoMin */
			/* @todo not the actual value, a guess,
			    needs to be calculated */
			*sint_ptr = 1000;
			break;

		case 3: /* tcpRtoMax */
			/* @todo not the actual value, a guess,
			   needs to be calculated */
			*sint_ptr = 60000;
			break;

		case 4: /* tcpMaxConn */
			*sint_ptr = MEMP_NUM_TCP_PCB;
			break;

		case 5: /* tcpActiveOpens */
			*uint_ptr = tcpactiveopens;
			break;

		case 6: /* tcpPassiveOpens */
			*uint_ptr = tcppassiveopens;
			break;

		case 7: /* tcpAttemptFails */
			*uint_ptr = tcpattemptfails;
			break;

		case 8: /* tcpEstabResets */
			*uint_ptr = tcpestabresets;
			break;

		case 9: { /* tcpCurrEstab */
			u16_t tcpcurrestab = 0;
			struct tcp_pcb* pcb = tcp_active_pcbs;

			while(pcb != NULL) {
				if((pcb->state == ESTABLISHED) ||
				        (pcb->state == CLOSE_WAIT)) {
					tcpcurrestab++;
				}

				pcb = pcb->next;
			}

			*uint_ptr = tcpcurrestab;
		}
		break;

		case 10: /* tcpInSegs */
			*uint_ptr = tcpinsegs;
			break;

		case 11: /* tcpOutSegs */
			*uint_ptr = tcpoutsegs;
			break;

		case 12: /* tcpRetransSegs */
			*uint_ptr = tcpretranssegs;
			break;

		case 14: /* tcpInErrs */
			*uint_ptr = tcpinerrs;
			break;

		case 15: /* tcpOutRsts */
			*uint_ptr = tcpoutrsts;
			break;
	}
}
#ifdef THIS_SEEMS_UNUSED
static void
tcpconnentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	/* return to object name, adding index depth (10) */
	ident_len += 10;
	ident -= 10;

	if(ident_len == 11) {
		u8_t id;

		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		id = ident[0];
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("get_object_def tcp.%"U16_F".0\n", (u16_t)id));

		switch(id) {
			case 1: /* tcpConnState */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			case 2: /* tcpConnLocalAddress */
			case 4: /* tcpConnRemAddress */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR);
				od->v_len = 4;
				break;

			case 3: /* tcpConnLocalPort */
			case 5: /* tcpConnRemPort */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			default:
				LWIP_DEBUGF(SNMP_MIB_DEBUG, ("tcpconnentry_get_object_def: no such object\n"));
				od->instance = MIB_OBJECT_NONE;
				break;
		};
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("tcpconnentry_get_object_def: no such object\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

static void
tcpconnentry_get_value(struct obj_def* od, u16_t len, void* value)
{
	ip_addr_t lip, rip;
	u16_t lport, rport;
	s32_t* ident;

	ident = od->id_inst_ptr;
	snmp_oidtoip(&ident[1], &lip);
	lport = ident[5];
	snmp_oidtoip(&ident[6], &rip);
	rport = ident[10];

	/** @todo find matching PCB */
}
#endif /* if 0 */
#endif

static void
udp_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	/* return to object name, adding index depth (1) */
	ident_len += 1;
	ident -= 1;

	if((ident_len == 2) &&
	        (ident[0] > 0) && (ident[0] < 6)) {
		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		od->instance = MIB_OBJECT_SCALAR;
		od->access = MIB_OBJECT_READ_ONLY;
		od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER);
		od->v_len = sizeof(u32_t);
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("udp_get_object_def: no scalar\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

static void
udp_get_value(struct obj_def* od, u16_t len, void* value)
{
	u32_t* uint_ptr = (u32_t*)value;
	u8_t id;

	LWIP_UNUSED_ARG(len);
	LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
	id = (u8_t)od->id_inst_ptr[0];

	switch(id) {
		case 1: /* udpInDatagrams */
			*uint_ptr = udpindatagrams;
			break;

		case 2: /* udpNoPorts */
			*uint_ptr = udpnoports;
			break;

		case 3: /* udpInErrors */
			*uint_ptr = udpinerrors;
			break;

		case 4: /* udpOutDatagrams */
			*uint_ptr = udpoutdatagrams;
			break;
	}
}

static void
udpentry_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	/* return to object name, adding index depth (5) */
	ident_len += 5;
	ident -= 5;

	if(ident_len == 6) {
		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		switch(ident[0]) {
			case 1: /* udpLocalAddress */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR);
				od->v_len = 4;
				break;

			case 2: /* udpLocalPort */
				od->instance = MIB_OBJECT_TAB;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			default:
				LWIP_DEBUGF(SNMP_MIB_DEBUG, ("udpentry_get_object_def: no such object\n"));
				od->instance = MIB_OBJECT_NONE;
				break;
		}
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("udpentry_get_object_def: no scalar\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

static void
udpentry_get_value(struct obj_def* od, u16_t len, void* value)
{
	u8_t id;
	struct udp_pcb* pcb;
	ip_addr_t ip;
	u16_t port;

	LWIP_UNUSED_ARG(len);
	snmp_oidtoip(&od->id_inst_ptr[1], &ip);
	LWIP_ASSERT("invalid port", (od->id_inst_ptr[5] >= 0) && (od->id_inst_ptr[5] <= 0xffff));
	port = (u16_t)od->id_inst_ptr[5];

	pcb = udp_pcbs;

	while((pcb != NULL) &&
	        !(ip_addr_cmp(&pcb->local_ip, &ip) &&
	          (pcb->local_port == port))) {
		pcb = pcb->next;
	}

	if(pcb != NULL) {
		LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
		id = (u8_t)od->id_inst_ptr[0];

		switch(id) {
			case 1: { /* udpLocalAddress */
				ip_addr_t* dst = (ip_addr_t*)value;
				*dst = pcb->local_ip;
			}
			break;

			case 2: { /* udpLocalPort */
				s32_t* sint_ptr = (s32_t*)value;
				*sint_ptr = pcb->local_port;
			}
			break;
		}
	}
}

static void
snmp_get_object_def(u8_t ident_len, s32_t* ident, struct obj_def* od)
{
	/* return to object name, adding index depth (1) */
	ident_len += 1;
	ident -= 1;

	if(ident_len == 2) {
		u8_t id;

		od->id_inst_len = ident_len;
		od->id_inst_ptr = ident;

		LWIP_ASSERT("invalid id", (ident[0] >= 0) && (ident[0] <= 0xff));
		id = (u8_t)ident[0];

		switch(id) {
			case 1: /* snmpInPkts */
			case 2: /* snmpOutPkts */
			case 3: /* snmpInBadVersions */
			case 4: /* snmpInBadCommunityNames */
			case 5: /* snmpInBadCommunityUses */
			case 6: /* snmpInASNParseErrs */
			case 8: /* snmpInTooBigs */
			case 9: /* snmpInNoSuchNames */
			case 10: /* snmpInBadValues */
			case 11: /* snmpInReadOnlys */
			case 12: /* snmpInGenErrs */
			case 13: /* snmpInTotalReqVars */
			case 14: /* snmpInTotalSetVars */
			case 15: /* snmpInGetRequests */
			case 16: /* snmpInGetNexts */
			case 17: /* snmpInSetRequests */
			case 18: /* snmpInGetResponses */
			case 19: /* snmpInTraps */
			case 20: /* snmpOutTooBigs */
			case 21: /* snmpOutNoSuchNames */
			case 22: /* snmpOutBadValues */
			case 24: /* snmpOutGenErrs */
			case 25: /* snmpOutGetRequests */
			case 26: /* snmpOutGetNexts */
			case 27: /* snmpOutSetRequests */
			case 28: /* snmpOutGetResponses */
			case 29: /* snmpOutTraps */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_ONLY;
				od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER);
				od->v_len = sizeof(u32_t);
				break;

			case 30: /* snmpEnableAuthenTraps */
				od->instance = MIB_OBJECT_SCALAR;
				od->access = MIB_OBJECT_READ_WRITE;
				od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
				od->v_len = sizeof(s32_t);
				break;

			default:
				LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_get_object_def: no such object\n"));
				od->instance = MIB_OBJECT_NONE;
				break;
		};
	} else {
		LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_get_object_def: no scalar\n"));
		od->instance = MIB_OBJECT_NONE;
	}
}

static void
snmp_get_value(struct obj_def* od, u16_t len, void* value)
{
	u32_t* uint_ptr = (u32_t*)value;
	u8_t id;

	LWIP_UNUSED_ARG(len);
	LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
	id = (u8_t)od->id_inst_ptr[0];

	switch(id) {
		case 1: /* snmpInPkts */
			*uint_ptr = snmpinpkts;
			break;

		case 2: /* snmpOutPkts */
			*uint_ptr = snmpoutpkts;
			break;

		case 3: /* snmpInBadVersions */
			*uint_ptr = snmpinbadversions;
			break;

		case 4: /* snmpInBadCommunityNames */
			*uint_ptr = snmpinbadcommunitynames;
			break;

		case 5: /* snmpInBadCommunityUses */
			*uint_ptr = snmpinbadcommunityuses;
			break;

		case 6: /* snmpInASNParseErrs */
			*uint_ptr = snmpinasnparseerrs;
			break;

		case 8: /* snmpInTooBigs */
			*uint_ptr = snmpintoobigs;
			break;

		case 9: /* snmpInNoSuchNames */
			*uint_ptr = snmpinnosuchnames;
			break;

		case 10: /* snmpInBadValues */
			*uint_ptr = snmpinbadvalues;
			break;

		case 11: /* snmpInReadOnlys */
			*uint_ptr = snmpinreadonlys;
			break;

		case 12: /* snmpInGenErrs */
			*uint_ptr = snmpingenerrs;
			break;

		case 13: /* snmpInTotalReqVars */
			*uint_ptr = snmpintotalreqvars;
			break;

		case 14: /* snmpInTotalSetVars */
			*uint_ptr = snmpintotalsetvars;
			break;

		case 15: /* snmpInGetRequests */
			*uint_ptr = snmpingetrequests;
			break;

		case 16: /* snmpInGetNexts */
			*uint_ptr = snmpingetnexts;
			break;

		case 17: /* snmpInSetRequests */
			*uint_ptr = snmpinsetrequests;
			break;

		case 18: /* snmpInGetResponses */
			*uint_ptr = snmpingetresponses;
			break;

		case 19: /* snmpInTraps */
			*uint_ptr = snmpintraps;
			break;

		case 20: /* snmpOutTooBigs */
			*uint_ptr = snmpouttoobigs;
			break;

		case 21: /* snmpOutNoSuchNames */
			*uint_ptr = snmpoutnosuchnames;
			break;

		case 22: /* snmpOutBadValues */
			*uint_ptr = snmpoutbadvalues;
			break;

		case 24: /* snmpOutGenErrs */
			*uint_ptr = snmpoutgenerrs;
			break;

		case 25: /* snmpOutGetRequests */
			*uint_ptr = snmpoutgetrequests;
			break;

		case 26: /* snmpOutGetNexts */
			*uint_ptr = snmpoutgetnexts;
			break;

		case 27: /* snmpOutSetRequests */
			*uint_ptr = snmpoutsetrequests;
			break;

		case 28: /* snmpOutGetResponses */
			*uint_ptr = snmpoutgetresponses;
			break;

		case 29: /* snmpOutTraps */
			*uint_ptr = snmpouttraps;
			break;

		case 30: /* snmpEnableAuthenTraps */
			*uint_ptr = *snmpenableauthentraps_ptr;
			break;
	};
}

/**
 * Test snmp object value before setting.
 *
 * @param od is the object definition
 * @param len return value space (in bytes)
 * @param value points to (varbind) space to copy value from.
 */
static u8_t
snmp_set_test(struct obj_def* od, u16_t len, void* value)
{
	u8_t id, set_ok;

	LWIP_UNUSED_ARG(len);
	set_ok = 0;
	LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
	id = (u8_t)od->id_inst_ptr[0];

	if(id == 30) {
		/* snmpEnableAuthenTraps */
		s32_t* sint_ptr = (s32_t*)value;

		if(snmpenableauthentraps_ptr != &snmpenableauthentraps_default) {
			/* we should have writable non-volatile mem here */
			if((*sint_ptr == 1) || (*sint_ptr == 2)) {
				set_ok = 1;
			}
		} else {
			/* const or hardwired value */
			if(*sint_ptr == snmpenableauthentraps_default) {
				set_ok = 1;
			}
		}
	}

	return set_ok;
}

static void
snmp_set_value(struct obj_def* od, u16_t len, void* value)
{
	u8_t id;

	LWIP_UNUSED_ARG(len);
	LWIP_ASSERT("invalid id", (od->id_inst_ptr[0] >= 0) && (od->id_inst_ptr[0] <= 0xff));
	id = (u8_t)od->id_inst_ptr[0];

	if(id == 30) {
		/* snmpEnableAuthenTraps */
		/* @todo @fixme: which kind of pointer is 'value'? s32_t or u8_t??? */
		u8_t* ptr = (u8_t*)value;
		*snmpenableauthentraps_ptr = *ptr;
	}
}

#endif /* LWIP_SNMP */
